Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Intel 387 floating point stuff. |
38edeab8 | 2 | |
6aba47ca | 3 | Copyright (C) 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001, |
9b254dd1 | 4 | 2002, 2003, 2004, 2005, 2007, 2008 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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 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 | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
786a90bb MK |
22 | #include "doublest.h" |
23 | #include "floatformat.h" | |
c906108c | 24 | #include "frame.h" |
786a90bb | 25 | #include "gdbcore.h" |
c906108c SS |
26 | #include "inferior.h" |
27 | #include "language.h" | |
4e052eda | 28 | #include "regcache.h" |
786a90bb MK |
29 | #include "value.h" |
30 | ||
d0df8472 | 31 | #include "gdb_assert.h" |
309367d4 | 32 | #include "gdb_string.h" |
c906108c | 33 | |
9a82579f | 34 | #include "i386-tdep.h" |
42c466d7 | 35 | #include "i387-tdep.h" |
c906108c | 36 | |
de57eccd | 37 | /* Print the floating point number specified by RAW. */ |
786a90bb | 38 | |
de57eccd | 39 | static void |
b4ad899f | 40 | print_i387_value (const gdb_byte *raw, struct ui_file *file) |
de57eccd JM |
41 | { |
42 | DOUBLEST value; | |
4583280c MK |
43 | |
44 | /* Using extract_typed_floating here might affect the representation | |
45 | of certain numbers such as NaNs, even if GDB is running natively. | |
46 | This is fine since our caller already detects such special | |
47 | numbers and we print the hexadecimal representation anyway. */ | |
48 | value = extract_typed_floating (raw, builtin_type_i387_ext); | |
de57eccd JM |
49 | |
50 | /* We try to print 19 digits. The last digit may or may not contain | |
51 | garbage, but we'd better print one too many. We need enough room | |
52 | to print the value, 1 position for the sign, 1 for the decimal | |
53 | point, 19 for the digits and 6 for the exponent adds up to 27. */ | |
54 | #ifdef PRINTF_HAS_LONG_DOUBLE | |
61113f8b | 55 | fprintf_filtered (file, " %-+27.19Lg", (long double) value); |
de57eccd | 56 | #else |
61113f8b | 57 | fprintf_filtered (file, " %-+27.19g", (double) value); |
de57eccd JM |
58 | #endif |
59 | } | |
60 | ||
61 | /* Print the classification for the register contents RAW. */ | |
786a90bb | 62 | |
de57eccd | 63 | static void |
b4ad899f | 64 | print_i387_ext (const gdb_byte *raw, struct ui_file *file) |
de57eccd JM |
65 | { |
66 | int sign; | |
67 | int integer; | |
68 | unsigned int exponent; | |
69 | unsigned long fraction[2]; | |
70 | ||
71 | sign = raw[9] & 0x80; | |
72 | integer = raw[7] & 0x80; | |
73 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
74 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
75 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
76 | | (raw[5] << 8) | raw[4]); | |
77 | ||
78 | if (exponent == 0x7fff && integer) | |
79 | { | |
80 | if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) | |
81 | /* Infinity. */ | |
61113f8b | 82 | fprintf_filtered (file, " %cInf", (sign ? '-' : '+')); |
de57eccd JM |
83 | else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) |
84 | /* Real Indefinite (QNaN). */ | |
61113f8b | 85 | fputs_unfiltered (" Real Indefinite (QNaN)", file); |
de57eccd JM |
86 | else if (fraction[1] & 0x40000000) |
87 | /* QNaN. */ | |
61113f8b | 88 | fputs_filtered (" QNaN", file); |
de57eccd JM |
89 | else |
90 | /* SNaN. */ | |
61113f8b | 91 | fputs_filtered (" SNaN", file); |
de57eccd JM |
92 | } |
93 | else if (exponent < 0x7fff && exponent > 0x0000 && integer) | |
94 | /* Normal. */ | |
61113f8b | 95 | print_i387_value (raw, file); |
de57eccd JM |
96 | else if (exponent == 0x0000) |
97 | { | |
98 | /* Denormal or zero. */ | |
61113f8b | 99 | print_i387_value (raw, file); |
de57eccd JM |
100 | |
101 | if (integer) | |
102 | /* Pseudo-denormal. */ | |
61113f8b | 103 | fputs_filtered (" Pseudo-denormal", file); |
de57eccd JM |
104 | else if (fraction[0] || fraction[1]) |
105 | /* Denormal. */ | |
61113f8b | 106 | fputs_filtered (" Denormal", file); |
de57eccd JM |
107 | } |
108 | else | |
109 | /* Unsupported. */ | |
61113f8b | 110 | fputs_filtered (" Unsupported", file); |
de57eccd JM |
111 | } |
112 | ||
113 | /* Print the status word STATUS. */ | |
786a90bb | 114 | |
de57eccd | 115 | static void |
61113f8b | 116 | print_i387_status_word (unsigned int status, struct ui_file *file) |
de57eccd | 117 | { |
61113f8b | 118 | fprintf_filtered (file, "Status Word: %s", |
bb599908 | 119 | hex_string_custom (status, 4)); |
61113f8b MK |
120 | fputs_filtered (" ", file); |
121 | fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " "); | |
122 | fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " "); | |
123 | fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : " "); | |
124 | fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : " "); | |
125 | fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : " "); | |
126 | fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : " "); | |
127 | fputs_filtered (" ", file); | |
128 | fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : " "); | |
129 | fputs_filtered (" ", file); | |
130 | fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : " "); | |
131 | fputs_filtered (" ", file); | |
132 | fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : " "); | |
133 | fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : " "); | |
134 | fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : " "); | |
135 | fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : " "); | |
136 | ||
137 | fputs_filtered ("\n", file); | |
138 | ||
139 | fprintf_filtered (file, | |
140 | " TOP: %d\n", ((status >> 11) & 7)); | |
de57eccd JM |
141 | } |
142 | ||
143 | /* Print the control word CONTROL. */ | |
786a90bb | 144 | |
de57eccd | 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", |
bb599908 | 149 | hex_string_custom (control, 4)); |
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 | { |
5716833c | 203 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); |
b4ad899f | 204 | gdb_byte buf[4]; |
1d70089a MK |
205 | ULONGEST fctrl; |
206 | ULONGEST fstat; | |
207 | ULONGEST ftag; | |
208 | ULONGEST fiseg; | |
209 | ULONGEST fioff; | |
210 | ULONGEST foseg; | |
211 | ULONGEST fooff; | |
212 | ULONGEST fop; | |
de57eccd JM |
213 | int fpreg; |
214 | int top; | |
215 | ||
5716833c MK |
216 | gdb_assert (gdbarch == get_frame_arch (frame)); |
217 | ||
20a6ec49 MD |
218 | fctrl = get_frame_register_unsigned (frame, I387_FCTRL_REGNUM (tdep)); |
219 | fstat = get_frame_register_unsigned (frame, I387_FSTAT_REGNUM (tdep)); | |
220 | ftag = get_frame_register_unsigned (frame, I387_FTAG_REGNUM (tdep)); | |
221 | fiseg = get_frame_register_unsigned (frame, I387_FISEG_REGNUM (tdep)); | |
222 | fioff = get_frame_register_unsigned (frame, I387_FIOFF_REGNUM (tdep)); | |
223 | foseg = get_frame_register_unsigned (frame, I387_FOSEG_REGNUM (tdep)); | |
224 | fooff = get_frame_register_unsigned (frame, I387_FOOFF_REGNUM (tdep)); | |
225 | fop = get_frame_register_unsigned (frame, I387_FOP_REGNUM (tdep)); | |
1d70089a | 226 | |
de57eccd JM |
227 | top = ((fstat >> 11) & 7); |
228 | ||
229 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
230 | { | |
b4ad899f | 231 | gdb_byte raw[I386_MAX_REGISTER_SIZE]; |
de57eccd JM |
232 | int tag = (ftag >> (fpreg * 2)) & 3; |
233 | int i; | |
234 | ||
61113f8b | 235 | fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg); |
de57eccd JM |
236 | |
237 | switch (tag) | |
238 | { | |
239 | case 0: | |
61113f8b | 240 | fputs_filtered ("Valid ", file); |
de57eccd JM |
241 | break; |
242 | case 1: | |
61113f8b | 243 | fputs_filtered ("Zero ", file); |
de57eccd JM |
244 | break; |
245 | case 2: | |
61113f8b | 246 | fputs_filtered ("Special ", file); |
de57eccd JM |
247 | break; |
248 | case 3: | |
61113f8b | 249 | fputs_filtered ("Empty ", file); |
de57eccd JM |
250 | break; |
251 | } | |
252 | ||
20a6ec49 MD |
253 | get_frame_register (frame, (fpreg + 8 - top) % 8 + I387_ST0_REGNUM (tdep), |
254 | raw); | |
de57eccd | 255 | |
61113f8b | 256 | fputs_filtered ("0x", file); |
de57eccd | 257 | for (i = 9; i >= 0; i--) |
61113f8b | 258 | fprintf_filtered (file, "%02x", raw[i]); |
de57eccd JM |
259 | |
260 | if (tag != 3) | |
61113f8b | 261 | print_i387_ext (raw, file); |
de57eccd | 262 | |
61113f8b | 263 | fputs_filtered ("\n", file); |
de57eccd JM |
264 | } |
265 | ||
f16a25ae | 266 | fputs_filtered ("\n", file); |
de57eccd | 267 | |
61113f8b MK |
268 | print_i387_status_word (fstat, file); |
269 | print_i387_control_word (fctrl, file); | |
270 | fprintf_filtered (file, "Tag Word: %s\n", | |
bb599908 | 271 | hex_string_custom (ftag, 4)); |
61113f8b | 272 | fprintf_filtered (file, "Instruction Pointer: %s:", |
bb599908 PH |
273 | hex_string_custom (fiseg, 2)); |
274 | fprintf_filtered (file, "%s\n", hex_string_custom (fioff, 8)); | |
61113f8b | 275 | fprintf_filtered (file, "Operand Pointer: %s:", |
bb599908 PH |
276 | hex_string_custom (foseg, 2)); |
277 | fprintf_filtered (file, "%s\n", hex_string_custom (fooff, 8)); | |
61113f8b | 278 | fprintf_filtered (file, "Opcode: %s\n", |
bb599908 | 279 | hex_string_custom (fop ? (fop | 0xd800) : 0, 4)); |
de57eccd | 280 | } |
d532c08f MK |
281 | \f |
282 | ||
83acabca DJ |
283 | /* Return nonzero if a value of type TYPE stored in register REGNUM |
284 | needs any special handling. */ | |
285 | ||
286 | int | |
0abe36f5 | 287 | i387_convert_register_p (struct gdbarch *gdbarch, int regnum, struct type *type) |
83acabca | 288 | { |
20a6ec49 | 289 | if (i386_fp_regnum_p (gdbarch, regnum)) |
83acabca DJ |
290 | { |
291 | /* Floating point registers must be converted unless we are | |
292 | accessing them in their hardware type. */ | |
293 | if (type == builtin_type_i387_ext) | |
294 | return 0; | |
295 | else | |
296 | return 1; | |
297 | } | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
d532c08f MK |
302 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and |
303 | return its contents in TO. */ | |
304 | ||
305 | void | |
306 | i387_register_to_value (struct frame_info *frame, int regnum, | |
42835c2b | 307 | struct type *type, gdb_byte *to) |
d532c08f | 308 | { |
b4ad899f | 309 | gdb_byte from[I386_MAX_REGISTER_SIZE]; |
d532c08f | 310 | |
20a6ec49 | 311 | gdb_assert (i386_fp_regnum_p (get_frame_arch (frame), regnum)); |
d532c08f MK |
312 | |
313 | /* We only support floating-point values. */ | |
314 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
315 | { | |
8a3fe4f8 AC |
316 | warning (_("Cannot convert floating-point register value " |
317 | "to non-floating-point type.")); | |
d532c08f MK |
318 | return; |
319 | } | |
320 | ||
83acabca | 321 | /* Convert to TYPE. */ |
192285c6 | 322 | get_frame_register (frame, regnum, from); |
d532c08f MK |
323 | convert_typed_floating (from, builtin_type_i387_ext, to, type); |
324 | } | |
325 | ||
326 | /* Write the contents FROM of a value of type TYPE into register | |
327 | REGNUM in frame FRAME. */ | |
328 | ||
329 | void | |
330 | i387_value_to_register (struct frame_info *frame, int regnum, | |
42835c2b | 331 | struct type *type, const gdb_byte *from) |
d532c08f | 332 | { |
b4ad899f | 333 | gdb_byte to[I386_MAX_REGISTER_SIZE]; |
d532c08f | 334 | |
20a6ec49 | 335 | gdb_assert (i386_fp_regnum_p (get_frame_arch (frame), regnum)); |
d532c08f MK |
336 | |
337 | /* We only support floating-point values. */ | |
338 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
339 | { | |
8a3fe4f8 AC |
340 | warning (_("Cannot convert non-floating-point type " |
341 | "to floating-point register value.")); | |
d532c08f MK |
342 | return; |
343 | } | |
344 | ||
83acabca | 345 | /* Convert from TYPE. */ |
d532c08f MK |
346 | convert_typed_floating (from, type, to, builtin_type_i387_ext); |
347 | put_frame_register (frame, regnum, to); | |
348 | } | |
349 | \f | |
e750d25e | 350 | |
786a90bb | 351 | /* Handle FSAVE and FXSAVE formats. */ |
e750d25e JT |
352 | |
353 | /* At fsave_offset[REGNUM] you'll find the offset to the location in | |
354 | the data structure used by the "fsave" instruction where GDB | |
355 | register REGNUM is stored. */ | |
356 | ||
357 | static int fsave_offset[] = | |
358 | { | |
5716833c MK |
359 | 28 + 0 * 10, /* %st(0) ... */ |
360 | 28 + 1 * 10, | |
361 | 28 + 2 * 10, | |
362 | 28 + 3 * 10, | |
363 | 28 + 4 * 10, | |
364 | 28 + 5 * 10, | |
365 | 28 + 6 * 10, | |
366 | 28 + 7 * 10, /* ... %st(7). */ | |
367 | 0, /* `fctrl' (16 bits). */ | |
368 | 4, /* `fstat' (16 bits). */ | |
369 | 8, /* `ftag' (16 bits). */ | |
370 | 16, /* `fiseg' (16 bits). */ | |
371 | 12, /* `fioff'. */ | |
372 | 24, /* `foseg' (16 bits). */ | |
373 | 20, /* `fooff'. */ | |
374 | 18 /* `fop' (bottom 11 bits). */ | |
e750d25e JT |
375 | }; |
376 | ||
20a6ec49 MD |
377 | #define FSAVE_ADDR(tdep, fsave, regnum) \ |
378 | (fsave + fsave_offset[regnum - I387_ST0_REGNUM (tdep)]) | |
e750d25e JT |
379 | \f |
380 | ||
41d041d6 MK |
381 | /* Fill register REGNUM in REGCACHE with the appropriate value from |
382 | *FSAVE. This function masks off any of the reserved bits in | |
383 | *FSAVE. */ | |
e750d25e JT |
384 | |
385 | void | |
41d041d6 | 386 | i387_supply_fsave (struct regcache *regcache, int regnum, const void *fsave) |
e750d25e | 387 | { |
41d041d6 | 388 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
b4ad899f | 389 | const gdb_byte *regs = fsave; |
e750d25e JT |
390 | int i; |
391 | ||
5716833c MK |
392 | gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); |
393 | ||
20a6ec49 | 394 | for (i = I387_ST0_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); i++) |
ed504bdf MK |
395 | if (regnum == -1 || regnum == i) |
396 | { | |
397 | if (fsave == NULL) | |
398 | { | |
5716833c MK |
399 | regcache_raw_supply (regcache, i, NULL); |
400 | continue; | |
ed504bdf MK |
401 | } |
402 | ||
403 | /* Most of the FPU control registers occupy only 16 bits in the | |
404 | fsave area. Give those a special treatment. */ | |
20a6ec49 MD |
405 | if (i >= I387_FCTRL_REGNUM (tdep) |
406 | && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep)) | |
ed504bdf | 407 | { |
b4ad899f | 408 | gdb_byte val[4]; |
ed504bdf | 409 | |
20a6ec49 | 410 | memcpy (val, FSAVE_ADDR (tdep, regs, i), 2); |
ed504bdf | 411 | val[2] = val[3] = 0; |
20a6ec49 | 412 | if (i == I387_FOP_REGNUM (tdep)) |
ed504bdf | 413 | val[1] &= ((1 << 3) - 1); |
5716833c | 414 | regcache_raw_supply (regcache, i, val); |
ed504bdf MK |
415 | } |
416 | else | |
20a6ec49 | 417 | regcache_raw_supply (regcache, i, FSAVE_ADDR (tdep, regs, i)); |
ed504bdf | 418 | } |
b87bc0d8 MK |
419 | |
420 | /* Provide dummy values for the SSE registers. */ | |
20a6ec49 | 421 | for (i = I387_XMM0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++) |
b87bc0d8 MK |
422 | if (regnum == -1 || regnum == i) |
423 | regcache_raw_supply (regcache, i, NULL); | |
20a6ec49 | 424 | if (regnum == -1 || regnum == I387_MXCSR_REGNUM (tdep)) |
b87bc0d8 | 425 | { |
b4ad899f | 426 | gdb_byte buf[4]; |
b87bc0d8 MK |
427 | |
428 | store_unsigned_integer (buf, 4, 0x1f80); | |
20a6ec49 | 429 | regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep), buf); |
b87bc0d8 | 430 | } |
e750d25e JT |
431 | } |
432 | ||
433 | /* Fill register REGNUM (if it is a floating-point register) in *FSAVE | |
63b6c53f MK |
434 | with the value from REGCACHE. If REGNUM is -1, do this for all |
435 | registers. This function doesn't touch any of the reserved bits in | |
436 | *FSAVE. */ | |
e750d25e JT |
437 | |
438 | void | |
63b6c53f | 439 | i387_collect_fsave (const struct regcache *regcache, int regnum, void *fsave) |
e750d25e | 440 | { |
e071d1f6 | 441 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
b4ad899f | 442 | gdb_byte *regs = fsave; |
e750d25e JT |
443 | int i; |
444 | ||
5716833c MK |
445 | gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); |
446 | ||
20a6ec49 | 447 | for (i = I387_ST0_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); i++) |
e750d25e JT |
448 | if (regnum == -1 || regnum == i) |
449 | { | |
450 | /* Most of the FPU control registers occupy only 16 bits in | |
451 | the fsave area. Give those a special treatment. */ | |
20a6ec49 MD |
452 | if (i >= I387_FCTRL_REGNUM (tdep) |
453 | && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep)) | |
e750d25e | 454 | { |
b4ad899f | 455 | gdb_byte buf[4]; |
e750d25e | 456 | |
5716833c | 457 | regcache_raw_collect (regcache, i, buf); |
e750d25e | 458 | |
20a6ec49 | 459 | if (i == I387_FOP_REGNUM (tdep)) |
e750d25e JT |
460 | { |
461 | /* The opcode occupies only 11 bits. Make sure we | |
462 | don't touch the other bits. */ | |
463 | buf[1] &= ((1 << 3) - 1); | |
20a6ec49 | 464 | buf[1] |= ((FSAVE_ADDR (tdep, regs, i))[1] & ~((1 << 3) - 1)); |
e750d25e | 465 | } |
20a6ec49 | 466 | memcpy (FSAVE_ADDR (tdep, regs, i), buf, 2); |
e750d25e JT |
467 | } |
468 | else | |
20a6ec49 | 469 | regcache_raw_collect (regcache, i, FSAVE_ADDR (tdep, regs, i)); |
e750d25e JT |
470 | } |
471 | } | |
472 | \f | |
473 | ||
474 | /* At fxsave_offset[REGNUM] you'll find the offset to the location in | |
475 | the data structure used by the "fxsave" instruction where GDB | |
476 | register REGNUM is stored. */ | |
477 | ||
478 | static int fxsave_offset[] = | |
479 | { | |
5716833c | 480 | 32, /* %st(0) through ... */ |
e750d25e JT |
481 | 48, |
482 | 64, | |
483 | 80, | |
484 | 96, | |
485 | 112, | |
486 | 128, | |
5716833c MK |
487 | 144, /* ... %st(7) (80 bits each). */ |
488 | 0, /* `fctrl' (16 bits). */ | |
489 | 2, /* `fstat' (16 bits). */ | |
490 | 4, /* `ftag' (16 bits). */ | |
491 | 12, /* `fiseg' (16 bits). */ | |
492 | 8, /* `fioff'. */ | |
493 | 20, /* `foseg' (16 bits). */ | |
494 | 16, /* `fooff'. */ | |
495 | 6, /* `fop' (bottom 11 bits). */ | |
496 | 160 + 0 * 16, /* %xmm0 through ... */ | |
04c8243f MK |
497 | 160 + 1 * 16, |
498 | 160 + 2 * 16, | |
499 | 160 + 3 * 16, | |
500 | 160 + 4 * 16, | |
501 | 160 + 5 * 16, | |
502 | 160 + 6 * 16, | |
503 | 160 + 7 * 16, | |
504 | 160 + 8 * 16, | |
505 | 160 + 9 * 16, | |
506 | 160 + 10 * 16, | |
507 | 160 + 11 * 16, | |
508 | 160 + 12 * 16, | |
509 | 160 + 13 * 16, | |
510 | 160 + 14 * 16, | |
5716833c | 511 | 160 + 15 * 16, /* ... %xmm15 (128 bits each). */ |
e750d25e JT |
512 | }; |
513 | ||
20a6ec49 MD |
514 | #define FXSAVE_ADDR(tdep, fxsave, regnum) \ |
515 | (fxsave + fxsave_offset[regnum - I387_ST0_REGNUM (tdep)]) | |
5716833c MK |
516 | |
517 | /* We made an unfortunate choice in putting %mxcsr after the SSE | |
518 | registers %xmm0-%xmm7 instead of before, since it makes supporting | |
519 | the registers %xmm8-%xmm15 on AMD64 a bit involved. Therefore we | |
520 | don't include the offset for %mxcsr here above. */ | |
521 | ||
522 | #define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24) | |
e750d25e | 523 | |
b4ad899f | 524 | static int i387_tag (const gdb_byte *raw); |
e750d25e JT |
525 | \f |
526 | ||
41d041d6 | 527 | /* Fill register REGNUM in REGCACHE with the appropriate |
ed504bdf MK |
528 | floating-point or SSE register value from *FXSAVE. This function |
529 | masks off any of the reserved bits in *FXSAVE. */ | |
e750d25e JT |
530 | |
531 | void | |
41d041d6 | 532 | i387_supply_fxsave (struct regcache *regcache, int regnum, const void *fxsave) |
e750d25e | 533 | { |
41d041d6 | 534 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
b4ad899f | 535 | const gdb_byte *regs = fxsave; |
5716833c MK |
536 | int i; |
537 | ||
538 | gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); | |
539 | gdb_assert (tdep->num_xmm_regs > 0); | |
dff95cc7 | 540 | |
20a6ec49 | 541 | for (i = I387_ST0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++) |
ed504bdf MK |
542 | if (regnum == -1 || regnum == i) |
543 | { | |
5716833c | 544 | if (regs == NULL) |
ed504bdf | 545 | { |
5716833c | 546 | regcache_raw_supply (regcache, i, NULL); |
ed504bdf MK |
547 | continue; |
548 | } | |
932bb524 | 549 | |
ed504bdf MK |
550 | /* Most of the FPU control registers occupy only 16 bits in |
551 | the fxsave area. Give those a special treatment. */ | |
20a6ec49 MD |
552 | if (i >= I387_FCTRL_REGNUM (tdep) && i < I387_XMM0_REGNUM (tdep) |
553 | && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep)) | |
ed504bdf | 554 | { |
b4ad899f | 555 | gdb_byte val[4]; |
ed504bdf | 556 | |
20a6ec49 | 557 | memcpy (val, FXSAVE_ADDR (tdep, regs, i), 2); |
ed504bdf | 558 | val[2] = val[3] = 0; |
20a6ec49 | 559 | if (i == I387_FOP_REGNUM (tdep)) |
ed504bdf | 560 | val[1] &= ((1 << 3) - 1); |
20a6ec49 | 561 | else if (i== I387_FTAG_REGNUM (tdep)) |
ed504bdf MK |
562 | { |
563 | /* The fxsave area contains a simplified version of | |
564 | the tag word. We have to look at the actual 80-bit | |
565 | FP data to recreate the traditional i387 tag word. */ | |
566 | ||
567 | unsigned long ftag = 0; | |
568 | int fpreg; | |
569 | int top; | |
570 | ||
20a6ec49 MD |
571 | top = ((FXSAVE_ADDR (tdep, regs, |
572 | I387_FSTAT_REGNUM (tdep)))[1] >> 3); | |
5716833c | 573 | top &= 0x7; |
ed504bdf MK |
574 | |
575 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
576 | { | |
577 | int tag; | |
578 | ||
579 | if (val[0] & (1 << fpreg)) | |
580 | { | |
20a6ec49 MD |
581 | int regnum = (fpreg + 8 - top) % 8 |
582 | + I387_ST0_REGNUM (tdep); | |
583 | tag = i387_tag (FXSAVE_ADDR (tdep, regs, regnum)); | |
ed504bdf MK |
584 | } |
585 | else | |
586 | tag = 3; /* Empty */ | |
587 | ||
588 | ftag |= tag << (2 * fpreg); | |
589 | } | |
590 | val[0] = ftag & 0xff; | |
591 | val[1] = (ftag >> 8) & 0xff; | |
592 | } | |
5716833c | 593 | regcache_raw_supply (regcache, i, val); |
ed504bdf MK |
594 | } |
595 | else | |
20a6ec49 | 596 | regcache_raw_supply (regcache, i, FXSAVE_ADDR (tdep, regs, i)); |
ed504bdf | 597 | } |
5716833c | 598 | |
20a6ec49 | 599 | if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1) |
5716833c MK |
600 | { |
601 | if (regs == NULL) | |
20a6ec49 | 602 | regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep), NULL); |
5716833c | 603 | else |
20a6ec49 | 604 | regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep), |
5716833c MK |
605 | FXSAVE_MXCSR_ADDR (regs)); |
606 | } | |
e750d25e JT |
607 | } |
608 | ||
609 | /* Fill register REGNUM (if it is a floating-point or SSE register) in | |
80571bff MK |
610 | *FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for |
611 | all registers. This function doesn't touch any of the reserved | |
612 | bits in *FXSAVE. */ | |
e750d25e JT |
613 | |
614 | void | |
80571bff | 615 | i387_collect_fxsave (const struct regcache *regcache, int regnum, void *fxsave) |
e750d25e | 616 | { |
e071d1f6 | 617 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); |
b4ad899f | 618 | gdb_byte *regs = fxsave; |
5716833c MK |
619 | int i; |
620 | ||
621 | gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); | |
622 | gdb_assert (tdep->num_xmm_regs > 0); | |
dff95cc7 | 623 | |
20a6ec49 | 624 | for (i = I387_ST0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++) |
e750d25e JT |
625 | if (regnum == -1 || regnum == i) |
626 | { | |
627 | /* Most of the FPU control registers occupy only 16 bits in | |
628 | the fxsave area. Give those a special treatment. */ | |
20a6ec49 MD |
629 | if (i >= I387_FCTRL_REGNUM (tdep) && i < I387_XMM0_REGNUM (tdep) |
630 | && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep)) | |
e750d25e | 631 | { |
b4ad899f | 632 | gdb_byte buf[4]; |
e750d25e | 633 | |
5716833c | 634 | regcache_raw_collect (regcache, i, buf); |
e750d25e | 635 | |
20a6ec49 | 636 | if (i == I387_FOP_REGNUM (tdep)) |
e750d25e JT |
637 | { |
638 | /* The opcode occupies only 11 bits. Make sure we | |
639 | don't touch the other bits. */ | |
640 | buf[1] &= ((1 << 3) - 1); | |
20a6ec49 | 641 | buf[1] |= ((FXSAVE_ADDR (tdep, regs, i))[1] & ~((1 << 3) - 1)); |
e750d25e | 642 | } |
20a6ec49 | 643 | else if (i == I387_FTAG_REGNUM (tdep)) |
e750d25e JT |
644 | { |
645 | /* Converting back is much easier. */ | |
646 | ||
647 | unsigned short ftag; | |
648 | int fpreg; | |
649 | ||
650 | ftag = (buf[1] << 8) | buf[0]; | |
651 | buf[0] = 0; | |
652 | buf[1] = 0; | |
653 | ||
654 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
655 | { | |
656 | int tag = (ftag >> (fpreg * 2)) & 3; | |
657 | ||
658 | if (tag != 3) | |
659 | buf[0] |= (1 << fpreg); | |
660 | } | |
661 | } | |
20a6ec49 | 662 | memcpy (FXSAVE_ADDR (tdep, regs, i), buf, 2); |
e750d25e JT |
663 | } |
664 | else | |
20a6ec49 | 665 | regcache_raw_collect (regcache, i, FXSAVE_ADDR (tdep, regs, i)); |
e750d25e | 666 | } |
5716833c | 667 | |
20a6ec49 MD |
668 | if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1) |
669 | regcache_raw_collect (regcache, I387_MXCSR_REGNUM (tdep), | |
5716833c | 670 | FXSAVE_MXCSR_ADDR (regs)); |
e750d25e JT |
671 | } |
672 | ||
673 | /* Recreate the FTW (tag word) valid bits from the 80-bit FP data in | |
674 | *RAW. */ | |
675 | ||
676 | static int | |
b4ad899f | 677 | i387_tag (const gdb_byte *raw) |
e750d25e JT |
678 | { |
679 | int integer; | |
680 | unsigned int exponent; | |
681 | unsigned long fraction[2]; | |
682 | ||
683 | integer = raw[7] & 0x80; | |
684 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
685 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
686 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
687 | | (raw[5] << 8) | raw[4]); | |
688 | ||
689 | if (exponent == 0x7fff) | |
690 | { | |
691 | /* Special. */ | |
692 | return (2); | |
693 | } | |
694 | else if (exponent == 0x0000) | |
695 | { | |
696 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
697 | { | |
698 | /* Zero. */ | |
699 | return (1); | |
700 | } | |
701 | else | |
702 | { | |
703 | /* Special. */ | |
704 | return (2); | |
705 | } | |
706 | } | |
707 | else | |
708 | { | |
709 | if (integer) | |
710 | { | |
711 | /* Valid. */ | |
712 | return (0); | |
713 | } | |
714 | else | |
715 | { | |
716 | /* Special. */ | |
717 | return (2); | |
718 | } | |
719 | } | |
720 | } | |
efb1c01c MK |
721 | |
722 | /* Prepare the FPU stack in REGCACHE for a function return. */ | |
723 | ||
724 | void | |
725 | i387_return_value (struct gdbarch *gdbarch, struct regcache *regcache) | |
726 | { | |
727 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
728 | ULONGEST fstat; | |
729 | ||
efb1c01c MK |
730 | /* Set the top of the floating-point register stack to 7. The |
731 | actual value doesn't really matter, but 7 is what a normal | |
732 | function return would end up with if the program started out with | |
733 | a freshly initialized FPU. */ | |
20a6ec49 | 734 | regcache_raw_read_unsigned (regcache, I387_FSTAT_REGNUM (tdep), &fstat); |
efb1c01c | 735 | fstat |= (7 << 11); |
20a6ec49 | 736 | regcache_raw_write_unsigned (regcache, I387_FSTAT_REGNUM (tdep), fstat); |
efb1c01c MK |
737 | |
738 | /* Mark %st(1) through %st(7) as empty. Since we set the top of the | |
739 | floating-point register stack to 7, the appropriate value for the | |
740 | tag word is 0x3fff. */ | |
20a6ec49 | 741 | regcache_raw_write_unsigned (regcache, I387_FTAG_REGNUM (tdep), 0x3fff); |
efb1c01c | 742 | |
efb1c01c | 743 | } |