1 /* i387-specific utility functions, for the remote server for GDB.
2 Copyright (C) 2000-2013 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "i386-xstate.h"
23 int num_xmm_registers
= 8;
25 /* Note: These functions preserve the reserved bits in control registers.
26 However, gdbserver promptly throws away that information. */
28 /* These structs should have the proper sizes and alignment on both
29 i386 and x86-64 machines. */
32 /* All these are only sixteen bits, plus padding, except for fop (which
33 is only eleven bits), and fooff / fioff (which are 32 bits each). */
47 /* Space for eight 80-bit FP values. */
48 unsigned char st_space
[80];
52 /* All these are only sixteen bits, plus padding, except for fop (which
53 is only eleven bits), and fooff / fioff (which are 32 bits each). */
68 /* Space for eight 80-bit FP values in 128-bit spaces. */
69 unsigned char st_space
[128];
71 /* Space for eight 128-bit XMM values, or 16 on x86-64. */
72 unsigned char xmm_space
[256];
76 /* All these are only sixteen bits, plus padding, except for fop (which
77 is only eleven bits), and fooff / fioff (which are 32 bits each). */
90 unsigned int mxcsr_mask
;
92 /* Space for eight 80-bit FP values in 128-bit spaces. */
93 unsigned char st_space
[128];
95 /* Space for eight 128-bit XMM values, or 16 on x86-64. */
96 unsigned char xmm_space
[256];
98 unsigned char reserved1
[48];
100 /* The extended control register 0 (the XFEATURE_ENABLED_MASK
102 unsigned long long xcr0
;
104 unsigned char reserved2
[40];
106 /* The XSTATE_BV bit vector. */
107 unsigned long long xstate_bv
;
109 unsigned char reserved3
[56];
111 /* Space for eight upper 128-bit YMM values, or 16 on x86-64. */
112 unsigned char ymmh_space
[256];
116 i387_cache_to_fsave (struct regcache
*regcache
, void *buf
)
118 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
120 int st0_regnum
= find_regno ("st0");
121 unsigned long val
, val2
;
123 for (i
= 0; i
< 8; i
++)
124 collect_register (regcache
, i
+ st0_regnum
,
125 ((char *) &fp
->st_space
[0]) + i
* 10);
127 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
128 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
130 /* This one's 11 bits... */
131 collect_register_by_name (regcache
, "fop", &val2
);
132 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
134 /* Some registers are 16-bit. */
135 collect_register_by_name (regcache
, "fctrl", &val
);
138 collect_register_by_name (regcache
, "fstat", &val
);
142 collect_register_by_name (regcache
, "ftag", &val
);
146 collect_register_by_name (regcache
, "fiseg", &val
);
150 collect_register_by_name (regcache
, "foseg", &val
);
156 i387_fsave_to_cache (struct regcache
*regcache
, const void *buf
)
158 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
160 int st0_regnum
= find_regno ("st0");
163 for (i
= 0; i
< 8; i
++)
164 supply_register (regcache
, i
+ st0_regnum
,
165 ((char *) &fp
->st_space
[0]) + i
* 10);
167 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
168 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
170 /* Some registers are 16-bit. */
171 val
= fp
->fctrl
& 0xFFFF;
172 supply_register_by_name (regcache
, "fctrl", &val
);
174 val
= fp
->fstat
& 0xFFFF;
175 supply_register_by_name (regcache
, "fstat", &val
);
177 val
= fp
->ftag
& 0xFFFF;
178 supply_register_by_name (regcache
, "ftag", &val
);
180 val
= fp
->fiseg
& 0xFFFF;
181 supply_register_by_name (regcache
, "fiseg", &val
);
183 val
= fp
->foseg
& 0xFFFF;
184 supply_register_by_name (regcache
, "foseg", &val
);
186 /* fop has only 11 valid bits. */
187 val
= (fp
->fop
) & 0x7FF;
188 supply_register_by_name (regcache
, "fop", &val
);
192 i387_cache_to_fxsave (struct regcache
*regcache
, void *buf
)
194 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
196 int st0_regnum
= find_regno ("st0");
197 int xmm0_regnum
= find_regno ("xmm0");
198 unsigned long val
, val2
;
200 for (i
= 0; i
< 8; i
++)
201 collect_register (regcache
, i
+ st0_regnum
,
202 ((char *) &fp
->st_space
[0]) + i
* 16);
203 for (i
= 0; i
< num_xmm_registers
; i
++)
204 collect_register (regcache
, i
+ xmm0_regnum
,
205 ((char *) &fp
->xmm_space
[0]) + i
* 16);
207 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
208 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
209 collect_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
211 /* This one's 11 bits... */
212 collect_register_by_name (regcache
, "fop", &val2
);
213 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
215 /* Some registers are 16-bit. */
216 collect_register_by_name (regcache
, "fctrl", &val
);
219 collect_register_by_name (regcache
, "fstat", &val
);
222 /* Convert to the simplifed tag form stored in fxsave data. */
223 collect_register_by_name (regcache
, "ftag", &val
);
226 for (i
= 7; i
>= 0; i
--)
228 int tag
= (val
>> (i
* 2)) & 3;
235 collect_register_by_name (regcache
, "fiseg", &val
);
238 collect_register_by_name (regcache
, "foseg", &val
);
243 i387_cache_to_xsave (struct regcache
*regcache
, void *buf
)
245 struct i387_xsave
*fp
= (struct i387_xsave
*) buf
;
247 unsigned long val
, val2
;
248 unsigned int clear_bv
;
249 unsigned long long xstate_bv
= 0;
253 /* The supported bits in `xstat_bv' are 1 byte. Clear part in
254 vector registers if its bit in xstat_bv is zero. */
255 clear_bv
= (~fp
->xstate_bv
) & x86_xcr0
;
257 /* Clear part in x87 and vector registers if its bit in xstat_bv is
261 if ((clear_bv
& I386_XSTATE_X87
))
262 for (i
= 0; i
< 8; i
++)
263 memset (((char *) &fp
->st_space
[0]) + i
* 16, 0, 10);
265 if ((clear_bv
& I386_XSTATE_SSE
))
266 for (i
= 0; i
< num_xmm_registers
; i
++)
267 memset (((char *) &fp
->xmm_space
[0]) + i
* 16, 0, 16);
269 if ((clear_bv
& I386_XSTATE_AVX
))
270 for (i
= 0; i
< num_xmm_registers
; i
++)
271 memset (((char *) &fp
->ymmh_space
[0]) + i
* 16, 0, 16);
274 /* Check if any x87 registers are changed. */
275 if ((x86_xcr0
& I386_XSTATE_X87
))
277 int st0_regnum
= find_regno ("st0");
279 for (i
= 0; i
< 8; i
++)
281 collect_register (regcache
, i
+ st0_regnum
, raw
);
282 p
= ((char *) &fp
->st_space
[0]) + i
* 16;
283 if (memcmp (raw
, p
, 10))
285 xstate_bv
|= I386_XSTATE_X87
;
291 /* Check if any SSE registers are changed. */
292 if ((x86_xcr0
& I386_XSTATE_SSE
))
294 int xmm0_regnum
= find_regno ("xmm0");
296 for (i
= 0; i
< num_xmm_registers
; i
++)
298 collect_register (regcache
, i
+ xmm0_regnum
, raw
);
299 p
= ((char *) &fp
->xmm_space
[0]) + i
* 16;
300 if (memcmp (raw
, p
, 16))
302 xstate_bv
|= I386_XSTATE_SSE
;
308 /* Check if any AVX registers are changed. */
309 if ((x86_xcr0
& I386_XSTATE_AVX
))
311 int ymm0h_regnum
= find_regno ("ymm0h");
313 for (i
= 0; i
< num_xmm_registers
; i
++)
315 collect_register (regcache
, i
+ ymm0h_regnum
, raw
);
316 p
= ((char *) &fp
->ymmh_space
[0]) + i
* 16;
317 if (memcmp (raw
, p
, 16))
319 xstate_bv
|= I386_XSTATE_AVX
;
325 /* Update the corresponding bits in xstate_bv if any SSE/AVX
326 registers are changed. */
327 fp
->xstate_bv
|= xstate_bv
;
329 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
330 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
331 collect_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
333 /* This one's 11 bits... */
334 collect_register_by_name (regcache
, "fop", &val2
);
335 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
337 /* Some registers are 16-bit. */
338 collect_register_by_name (regcache
, "fctrl", &val
);
341 collect_register_by_name (regcache
, "fstat", &val
);
344 /* Convert to the simplifed tag form stored in fxsave data. */
345 collect_register_by_name (regcache
, "ftag", &val
);
348 for (i
= 7; i
>= 0; i
--)
350 int tag
= (val
>> (i
* 2)) & 3;
357 collect_register_by_name (regcache
, "fiseg", &val
);
360 collect_register_by_name (regcache
, "foseg", &val
);
365 i387_ftag (struct i387_fxsave
*fp
, int regno
)
367 unsigned char *raw
= &fp
->st_space
[regno
* 16];
368 unsigned int exponent
;
369 unsigned long fraction
[2];
372 integer
= raw
[7] & 0x80;
373 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
374 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
375 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
376 | (raw
[5] << 8) | raw
[4]);
378 if (exponent
== 0x7fff)
383 else if (exponent
== 0x0000)
385 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
412 i387_fxsave_to_cache (struct regcache
*regcache
, const void *buf
)
414 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
416 int st0_regnum
= find_regno ("st0");
417 int xmm0_regnum
= find_regno ("xmm0");
420 for (i
= 0; i
< 8; i
++)
421 supply_register (regcache
, i
+ st0_regnum
,
422 ((char *) &fp
->st_space
[0]) + i
* 16);
423 for (i
= 0; i
< num_xmm_registers
; i
++)
424 supply_register (regcache
, i
+ xmm0_regnum
,
425 ((char *) &fp
->xmm_space
[0]) + i
* 16);
427 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
428 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
429 supply_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
431 /* Some registers are 16-bit. */
432 val
= fp
->fctrl
& 0xFFFF;
433 supply_register_by_name (regcache
, "fctrl", &val
);
435 val
= fp
->fstat
& 0xFFFF;
436 supply_register_by_name (regcache
, "fstat", &val
);
438 /* Generate the form of ftag data that GDB expects. */
439 top
= (fp
->fstat
>> 11) & 0x7;
441 for (i
= 7; i
>= 0; i
--)
444 if (fp
->ftag
& (1 << i
))
445 tag
= i387_ftag (fp
, (i
+ 8 - top
) % 8);
448 val
|= tag
<< (2 * i
);
450 supply_register_by_name (regcache
, "ftag", &val
);
452 val
= fp
->fiseg
& 0xFFFF;
453 supply_register_by_name (regcache
, "fiseg", &val
);
455 val
= fp
->foseg
& 0xFFFF;
456 supply_register_by_name (regcache
, "foseg", &val
);
458 val
= (fp
->fop
) & 0x7FF;
459 supply_register_by_name (regcache
, "fop", &val
);
463 i387_xsave_to_cache (struct regcache
*regcache
, const void *buf
)
465 struct i387_xsave
*fp
= (struct i387_xsave
*) buf
;
466 struct i387_fxsave
*fxp
= (struct i387_fxsave
*) buf
;
469 unsigned int clear_bv
;
472 /* The supported bits in `xstat_bv' are 1 byte. Clear part in
473 vector registers if its bit in xstat_bv is zero. */
474 clear_bv
= (~fp
->xstate_bv
) & x86_xcr0
;
476 /* Check if any x87 registers are changed. */
477 if ((x86_xcr0
& I386_XSTATE_X87
) != 0)
479 int st0_regnum
= find_regno ("st0");
481 if ((clear_bv
& I386_XSTATE_X87
) != 0)
483 for (i
= 0; i
< 8; i
++)
484 supply_register_zeroed (regcache
, i
+ st0_regnum
);
488 p
= (gdb_byte
*) &fp
->st_space
[0];
489 for (i
= 0; i
< 8; i
++)
490 supply_register (regcache
, i
+ st0_regnum
, p
+ i
* 16);
494 if ((x86_xcr0
& I386_XSTATE_SSE
) != 0)
496 int xmm0_regnum
= find_regno ("xmm0");
498 if ((clear_bv
& I386_XSTATE_SSE
))
500 for (i
= 0; i
< num_xmm_registers
; i
++)
501 supply_register_zeroed (regcache
, i
+ xmm0_regnum
);
505 p
= (gdb_byte
*) &fp
->xmm_space
[0];
506 for (i
= 0; i
< num_xmm_registers
; i
++)
507 supply_register (regcache
, i
+ xmm0_regnum
, p
+ i
* 16);
511 if ((x86_xcr0
& I386_XSTATE_AVX
) != 0)
513 int ymm0h_regnum
= find_regno ("ymm0h");
515 if ((clear_bv
& I386_XSTATE_AVX
) != 0)
517 for (i
= 0; i
< num_xmm_registers
; i
++)
518 supply_register_zeroed (regcache
, i
+ ymm0h_regnum
);
522 p
= (gdb_byte
*) &fp
->ymmh_space
[0];
523 for (i
= 0; i
< num_xmm_registers
; i
++)
524 supply_register (regcache
, i
+ ymm0h_regnum
, p
+ i
* 16);
528 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
529 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
530 supply_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
532 /* Some registers are 16-bit. */
533 val
= fp
->fctrl
& 0xFFFF;
534 supply_register_by_name (regcache
, "fctrl", &val
);
536 val
= fp
->fstat
& 0xFFFF;
537 supply_register_by_name (regcache
, "fstat", &val
);
539 /* Generate the form of ftag data that GDB expects. */
540 top
= (fp
->fstat
>> 11) & 0x7;
542 for (i
= 7; i
>= 0; i
--)
545 if (fp
->ftag
& (1 << i
))
546 tag
= i387_ftag (fxp
, (i
+ 8 - top
) % 8);
549 val
|= tag
<< (2 * i
);
551 supply_register_by_name (regcache
, "ftag", &val
);
553 val
= fp
->fiseg
& 0xFFFF;
554 supply_register_by_name (regcache
, "fiseg", &val
);
556 val
= fp
->foseg
& 0xFFFF;
557 supply_register_by_name (regcache
, "foseg", &val
);
559 val
= (fp
->fop
) & 0x7FF;
560 supply_register_by_name (regcache
, "fop", &val
);
563 /* Default to SSE. */
564 unsigned long long x86_xcr0
= I386_XSTATE_SSE_MASK
;
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