1 /* i387-specific utility functions, for the remote server for GDB.
2 Copyright (C) 2000-2002, 2005, 2007-2012 Free Software Foundation,
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "i386-xstate.h"
24 int num_xmm_registers
= 8;
26 /* Note: These functions preserve the reserved bits in control registers.
27 However, gdbserver promptly throws away that information. */
29 /* These structs should have the proper sizes and alignment on both
30 i386 and x86-64 machines. */
33 /* All these are only sixteen bits, plus padding, except for fop (which
34 is only eleven bits), and fooff / fioff (which are 32 bits each). */
48 /* Space for eight 80-bit FP values. */
49 unsigned char st_space
[80];
53 /* All these are only sixteen bits, plus padding, except for fop (which
54 is only eleven bits), and fooff / fioff (which are 32 bits each). */
69 /* Space for eight 80-bit FP values in 128-bit spaces. */
70 unsigned char st_space
[128];
72 /* Space for eight 128-bit XMM values, or 16 on x86-64. */
73 unsigned char xmm_space
[256];
77 /* All these are only sixteen bits, plus padding, except for fop (which
78 is only eleven bits), and fooff / fioff (which are 32 bits each). */
91 unsigned int mxcsr_mask
;
93 /* Space for eight 80-bit FP values in 128-bit spaces. */
94 unsigned char st_space
[128];
96 /* Space for eight 128-bit XMM values, or 16 on x86-64. */
97 unsigned char xmm_space
[256];
99 unsigned char reserved1
[48];
101 /* The extended control register 0 (the XFEATURE_ENABLED_MASK
103 unsigned long long xcr0
;
105 unsigned char reserved2
[40];
107 /* The XSTATE_BV bit vector. */
108 unsigned long long xstate_bv
;
110 unsigned char reserved3
[56];
112 /* Space for eight upper 128-bit YMM values, or 16 on x86-64. */
113 unsigned char ymmh_space
[256];
117 i387_cache_to_fsave (struct regcache
*regcache
, void *buf
)
119 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
121 int st0_regnum
= find_regno ("st0");
122 unsigned long val
, val2
;
124 for (i
= 0; i
< 8; i
++)
125 collect_register (regcache
, i
+ st0_regnum
,
126 ((char *) &fp
->st_space
[0]) + i
* 10);
128 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
129 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
131 /* This one's 11 bits... */
132 collect_register_by_name (regcache
, "fop", &val2
);
133 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
135 /* Some registers are 16-bit. */
136 collect_register_by_name (regcache
, "fctrl", &val
);
139 collect_register_by_name (regcache
, "fstat", &val
);
143 collect_register_by_name (regcache
, "ftag", &val
);
147 collect_register_by_name (regcache
, "fiseg", &val
);
151 collect_register_by_name (regcache
, "foseg", &val
);
157 i387_fsave_to_cache (struct regcache
*regcache
, const void *buf
)
159 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
161 int st0_regnum
= find_regno ("st0");
164 for (i
= 0; i
< 8; i
++)
165 supply_register (regcache
, i
+ st0_regnum
,
166 ((char *) &fp
->st_space
[0]) + i
* 10);
168 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
169 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
171 /* Some registers are 16-bit. */
172 val
= fp
->fctrl
& 0xFFFF;
173 supply_register_by_name (regcache
, "fctrl", &val
);
175 val
= fp
->fstat
& 0xFFFF;
176 supply_register_by_name (regcache
, "fstat", &val
);
178 val
= fp
->ftag
& 0xFFFF;
179 supply_register_by_name (regcache
, "ftag", &val
);
181 val
= fp
->fiseg
& 0xFFFF;
182 supply_register_by_name (regcache
, "fiseg", &val
);
184 val
= fp
->foseg
& 0xFFFF;
185 supply_register_by_name (regcache
, "foseg", &val
);
187 /* fop has only 11 valid bits. */
188 val
= (fp
->fop
) & 0x7FF;
189 supply_register_by_name (regcache
, "fop", &val
);
193 i387_cache_to_fxsave (struct regcache
*regcache
, void *buf
)
195 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
197 int st0_regnum
= find_regno ("st0");
198 int xmm0_regnum
= find_regno ("xmm0");
199 unsigned long val
, val2
;
201 for (i
= 0; i
< 8; i
++)
202 collect_register (regcache
, i
+ st0_regnum
,
203 ((char *) &fp
->st_space
[0]) + i
* 16);
204 for (i
= 0; i
< num_xmm_registers
; i
++)
205 collect_register (regcache
, i
+ xmm0_regnum
,
206 ((char *) &fp
->xmm_space
[0]) + i
* 16);
208 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
209 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
210 collect_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
212 /* This one's 11 bits... */
213 collect_register_by_name (regcache
, "fop", &val2
);
214 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
216 /* Some registers are 16-bit. */
217 collect_register_by_name (regcache
, "fctrl", &val
);
220 collect_register_by_name (regcache
, "fstat", &val
);
223 /* Convert to the simplifed tag form stored in fxsave data. */
224 collect_register_by_name (regcache
, "ftag", &val
);
227 for (i
= 7; i
>= 0; i
--)
229 int tag
= (val
>> (i
* 2)) & 3;
236 collect_register_by_name (regcache
, "fiseg", &val
);
239 collect_register_by_name (regcache
, "foseg", &val
);
244 i387_cache_to_xsave (struct regcache
*regcache
, void *buf
)
246 struct i387_xsave
*fp
= (struct i387_xsave
*) buf
;
248 unsigned long val
, val2
;
249 unsigned int clear_bv
;
250 unsigned long long xstate_bv
= 0;
254 /* The supported bits in `xstat_bv' are 1 byte. Clear part in
255 vector registers if its bit in xstat_bv is zero. */
256 clear_bv
= (~fp
->xstate_bv
) & x86_xcr0
;
258 /* Clear part in x87 and vector registers if its bit in xstat_bv is
262 if ((clear_bv
& I386_XSTATE_X87
))
263 for (i
= 0; i
< 8; i
++)
264 memset (((char *) &fp
->st_space
[0]) + i
* 16, 0, 10);
266 if ((clear_bv
& I386_XSTATE_SSE
))
267 for (i
= 0; i
< num_xmm_registers
; i
++)
268 memset (((char *) &fp
->xmm_space
[0]) + i
* 16, 0, 16);
270 if ((clear_bv
& I386_XSTATE_AVX
))
271 for (i
= 0; i
< num_xmm_registers
; i
++)
272 memset (((char *) &fp
->ymmh_space
[0]) + i
* 16, 0, 16);
275 /* Check if any x87 registers are changed. */
276 if ((x86_xcr0
& I386_XSTATE_X87
))
278 int st0_regnum
= find_regno ("st0");
280 for (i
= 0; i
< 8; i
++)
282 collect_register (regcache
, i
+ st0_regnum
, raw
);
283 p
= ((char *) &fp
->st_space
[0]) + i
* 16;
284 if (memcmp (raw
, p
, 10))
286 xstate_bv
|= I386_XSTATE_X87
;
292 /* Check if any SSE registers are changed. */
293 if ((x86_xcr0
& I386_XSTATE_SSE
))
295 int xmm0_regnum
= find_regno ("xmm0");
297 for (i
= 0; i
< num_xmm_registers
; i
++)
299 collect_register (regcache
, i
+ xmm0_regnum
, raw
);
300 p
= ((char *) &fp
->xmm_space
[0]) + i
* 16;
301 if (memcmp (raw
, p
, 16))
303 xstate_bv
|= I386_XSTATE_SSE
;
309 /* Check if any AVX registers are changed. */
310 if ((x86_xcr0
& I386_XSTATE_AVX
))
312 int ymm0h_regnum
= find_regno ("ymm0h");
314 for (i
= 0; i
< num_xmm_registers
; i
++)
316 collect_register (regcache
, i
+ ymm0h_regnum
, raw
);
317 p
= ((char *) &fp
->ymmh_space
[0]) + i
* 16;
318 if (memcmp (raw
, p
, 16))
320 xstate_bv
|= I386_XSTATE_AVX
;
326 /* Update the corresponding bits in xstate_bv if any SSE/AVX
327 registers are changed. */
328 fp
->xstate_bv
|= xstate_bv
;
330 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
331 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
332 collect_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
334 /* This one's 11 bits... */
335 collect_register_by_name (regcache
, "fop", &val2
);
336 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
338 /* Some registers are 16-bit. */
339 collect_register_by_name (regcache
, "fctrl", &val
);
342 collect_register_by_name (regcache
, "fstat", &val
);
345 /* Convert to the simplifed tag form stored in fxsave data. */
346 collect_register_by_name (regcache
, "ftag", &val
);
349 for (i
= 7; i
>= 0; i
--)
351 int tag
= (val
>> (i
* 2)) & 3;
358 collect_register_by_name (regcache
, "fiseg", &val
);
361 collect_register_by_name (regcache
, "foseg", &val
);
366 i387_ftag (struct i387_fxsave
*fp
, int regno
)
368 unsigned char *raw
= &fp
->st_space
[regno
* 16];
369 unsigned int exponent
;
370 unsigned long fraction
[2];
373 integer
= raw
[7] & 0x80;
374 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
375 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
376 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
377 | (raw
[5] << 8) | raw
[4]);
379 if (exponent
== 0x7fff)
384 else if (exponent
== 0x0000)
386 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
413 i387_fxsave_to_cache (struct regcache
*regcache
, const void *buf
)
415 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
417 int st0_regnum
= find_regno ("st0");
418 int xmm0_regnum
= find_regno ("xmm0");
421 for (i
= 0; i
< 8; i
++)
422 supply_register (regcache
, i
+ st0_regnum
,
423 ((char *) &fp
->st_space
[0]) + i
* 16);
424 for (i
= 0; i
< num_xmm_registers
; i
++)
425 supply_register (regcache
, i
+ xmm0_regnum
,
426 ((char *) &fp
->xmm_space
[0]) + i
* 16);
428 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
429 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
430 supply_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
432 /* Some registers are 16-bit. */
433 val
= fp
->fctrl
& 0xFFFF;
434 supply_register_by_name (regcache
, "fctrl", &val
);
436 val
= fp
->fstat
& 0xFFFF;
437 supply_register_by_name (regcache
, "fstat", &val
);
439 /* Generate the form of ftag data that GDB expects. */
440 top
= (fp
->fstat
>> 11) & 0x7;
442 for (i
= 7; i
>= 0; i
--)
445 if (fp
->ftag
& (1 << i
))
446 tag
= i387_ftag (fp
, (i
+ 8 - top
) % 8);
449 val
|= tag
<< (2 * i
);
451 supply_register_by_name (regcache
, "ftag", &val
);
453 val
= fp
->fiseg
& 0xFFFF;
454 supply_register_by_name (regcache
, "fiseg", &val
);
456 val
= fp
->foseg
& 0xFFFF;
457 supply_register_by_name (regcache
, "foseg", &val
);
459 val
= (fp
->fop
) & 0x7FF;
460 supply_register_by_name (regcache
, "fop", &val
);
464 i387_xsave_to_cache (struct regcache
*regcache
, const void *buf
)
466 struct i387_xsave
*fp
= (struct i387_xsave
*) buf
;
467 struct i387_fxsave
*fxp
= (struct i387_fxsave
*) buf
;
470 unsigned int clear_bv
;
473 /* The supported bits in `xstat_bv' are 1 byte. Clear part in
474 vector registers if its bit in xstat_bv is zero. */
475 clear_bv
= (~fp
->xstate_bv
) & x86_xcr0
;
477 /* Check if any x87 registers are changed. */
478 if ((x86_xcr0
& I386_XSTATE_X87
) != 0)
480 int st0_regnum
= find_regno ("st0");
482 if ((clear_bv
& I386_XSTATE_X87
) != 0)
484 for (i
= 0; i
< 8; i
++)
485 supply_register_zeroed (regcache
, i
+ st0_regnum
);
489 p
= (gdb_byte
*) &fp
->st_space
[0];
490 for (i
= 0; i
< 8; i
++)
491 supply_register (regcache
, i
+ st0_regnum
, p
+ i
* 16);
495 if ((x86_xcr0
& I386_XSTATE_SSE
) != 0)
497 int xmm0_regnum
= find_regno ("xmm0");
499 if ((clear_bv
& I386_XSTATE_SSE
))
501 for (i
= 0; i
< num_xmm_registers
; i
++)
502 supply_register_zeroed (regcache
, i
+ xmm0_regnum
);
506 p
= (gdb_byte
*) &fp
->xmm_space
[0];
507 for (i
= 0; i
< num_xmm_registers
; i
++)
508 supply_register (regcache
, i
+ xmm0_regnum
, p
+ i
* 16);
512 if ((x86_xcr0
& I386_XSTATE_AVX
) != 0)
514 int ymm0h_regnum
= find_regno ("ymm0h");
516 if ((clear_bv
& I386_XSTATE_AVX
) != 0)
518 for (i
= 0; i
< num_xmm_registers
; i
++)
519 supply_register_zeroed (regcache
, i
+ ymm0h_regnum
);
523 p
= (gdb_byte
*) &fp
->ymmh_space
[0];
524 for (i
= 0; i
< num_xmm_registers
; i
++)
525 supply_register (regcache
, i
+ ymm0h_regnum
, p
+ i
* 16);
529 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
530 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
531 supply_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
533 /* Some registers are 16-bit. */
534 val
= fp
->fctrl
& 0xFFFF;
535 supply_register_by_name (regcache
, "fctrl", &val
);
537 val
= fp
->fstat
& 0xFFFF;
538 supply_register_by_name (regcache
, "fstat", &val
);
540 /* Generate the form of ftag data that GDB expects. */
541 top
= (fp
->fstat
>> 11) & 0x7;
543 for (i
= 7; i
>= 0; i
--)
546 if (fp
->ftag
& (1 << i
))
547 tag
= i387_ftag (fxp
, (i
+ 8 - top
) % 8);
550 val
|= tag
<< (2 * i
);
552 supply_register_by_name (regcache
, "ftag", &val
);
554 val
= fp
->fiseg
& 0xFFFF;
555 supply_register_by_name (regcache
, "fiseg", &val
);
557 val
= fp
->foseg
& 0xFFFF;
558 supply_register_by_name (regcache
, "foseg", &val
);
560 val
= (fp
->fop
) & 0x7FF;
561 supply_register_by_name (regcache
, "fop", &val
);
564 /* Default to SSE. */
565 unsigned long long x86_xcr0
= I386_XSTATE_SSE_MASK
;
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