26e4e50d6372866b231799a34328f237d6719bf9
1 /* Intel 387 floating point stuff.
3 Copyright (C) 1988-1989, 1991-1994, 1998-2005, 2007-2012 Free
4 Software Foundation, Inc.
6 This file is part of GDB.
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 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "floatformat.h"
31 #include "gdb_assert.h"
32 #include "gdb_string.h"
34 #include "i386-tdep.h"
35 #include "i387-tdep.h"
36 #include "i386-xstate.h"
38 /* Print the floating point number specified by RAW. */
41 print_i387_value (struct gdbarch
*gdbarch
,
42 const gdb_byte
*raw
, struct ui_file
*file
)
46 /* Using extract_typed_floating here might affect the representation
47 of certain numbers such as NaNs, even if GDB is running natively.
48 This is fine since our caller already detects such special
49 numbers and we print the hexadecimal representation anyway. */
50 value
= extract_typed_floating (raw
, i387_ext_type (gdbarch
));
52 /* We try to print 19 digits. The last digit may or may not contain
53 garbage, but we'd better print one too many. We need enough room
54 to print the value, 1 position for the sign, 1 for the decimal
55 point, 19 for the digits and 6 for the exponent adds up to 27. */
56 #ifdef PRINTF_HAS_LONG_DOUBLE
57 fprintf_filtered (file
, " %-+27.19Lg", (long double) value
);
59 fprintf_filtered (file
, " %-+27.19g", (double) value
);
63 /* Print the classification for the register contents RAW. */
66 print_i387_ext (struct gdbarch
*gdbarch
,
67 const gdb_byte
*raw
, struct ui_file
*file
)
71 unsigned int exponent
;
72 unsigned long fraction
[2];
75 integer
= raw
[7] & 0x80;
76 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
77 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
78 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
79 | (raw
[5] << 8) | raw
[4]);
81 if (exponent
== 0x7fff && integer
)
83 if (fraction
[0] == 0x00000000 && fraction
[1] == 0x00000000)
85 fprintf_filtered (file
, " %cInf", (sign
? '-' : '+'));
86 else if (sign
&& fraction
[0] == 0x00000000 && fraction
[1] == 0x40000000)
87 /* Real Indefinite (QNaN). */
88 fputs_unfiltered (" Real Indefinite (QNaN)", file
);
89 else if (fraction
[1] & 0x40000000)
91 fputs_filtered (" QNaN", file
);
94 fputs_filtered (" SNaN", file
);
96 else if (exponent
< 0x7fff && exponent
> 0x0000 && integer
)
98 print_i387_value (gdbarch
, raw
, file
);
99 else if (exponent
== 0x0000)
101 /* Denormal or zero. */
102 print_i387_value (gdbarch
, raw
, file
);
105 /* Pseudo-denormal. */
106 fputs_filtered (" Pseudo-denormal", file
);
107 else if (fraction
[0] || fraction
[1])
109 fputs_filtered (" Denormal", file
);
113 fputs_filtered (" Unsupported", file
);
116 /* Print the status word STATUS. If STATUS_P is false, then STATUS
120 print_i387_status_word (int status_p
,
121 unsigned int status
, struct ui_file
*file
)
123 fprintf_filtered (file
, "Status Word: ");
126 fprintf_filtered (file
, "%s\n", _("<unavailable>"));
130 fprintf_filtered (file
, "%s", hex_string_custom (status
, 4));
131 fputs_filtered (" ", file
);
132 fprintf_filtered (file
, " %s", (status
& 0x0001) ? "IE" : " ");
133 fprintf_filtered (file
, " %s", (status
& 0x0002) ? "DE" : " ");
134 fprintf_filtered (file
, " %s", (status
& 0x0004) ? "ZE" : " ");
135 fprintf_filtered (file
, " %s", (status
& 0x0008) ? "OE" : " ");
136 fprintf_filtered (file
, " %s", (status
& 0x0010) ? "UE" : " ");
137 fprintf_filtered (file
, " %s", (status
& 0x0020) ? "PE" : " ");
138 fputs_filtered (" ", file
);
139 fprintf_filtered (file
, " %s", (status
& 0x0080) ? "ES" : " ");
140 fputs_filtered (" ", file
);
141 fprintf_filtered (file
, " %s", (status
& 0x0040) ? "SF" : " ");
142 fputs_filtered (" ", file
);
143 fprintf_filtered (file
, " %s", (status
& 0x0100) ? "C0" : " ");
144 fprintf_filtered (file
, " %s", (status
& 0x0200) ? "C1" : " ");
145 fprintf_filtered (file
, " %s", (status
& 0x0400) ? "C2" : " ");
146 fprintf_filtered (file
, " %s", (status
& 0x4000) ? "C3" : " ");
148 fputs_filtered ("\n", file
);
150 fprintf_filtered (file
,
151 " TOP: %d\n", ((status
>> 11) & 7));
154 /* Print the control word CONTROL. If CONTROL_P is false, then
155 CONTROL was unavailable. */
158 print_i387_control_word (int control_p
,
159 unsigned int control
, struct ui_file
*file
)
161 fprintf_filtered (file
, "Control Word: ");
164 fprintf_filtered (file
, "%s\n", _("<unavailable>"));
168 fprintf_filtered (file
, "%s", hex_string_custom (control
, 4));
169 fputs_filtered (" ", file
);
170 fprintf_filtered (file
, " %s", (control
& 0x0001) ? "IM" : " ");
171 fprintf_filtered (file
, " %s", (control
& 0x0002) ? "DM" : " ");
172 fprintf_filtered (file
, " %s", (control
& 0x0004) ? "ZM" : " ");
173 fprintf_filtered (file
, " %s", (control
& 0x0008) ? "OM" : " ");
174 fprintf_filtered (file
, " %s", (control
& 0x0010) ? "UM" : " ");
175 fprintf_filtered (file
, " %s", (control
& 0x0020) ? "PM" : " ");
177 fputs_filtered ("\n", file
);
179 fputs_filtered (" PC: ", file
);
180 switch ((control
>> 8) & 3)
183 fputs_filtered ("Single Precision (24-bits)\n", file
);
186 fputs_filtered ("Reserved\n", file
);
189 fputs_filtered ("Double Precision (53-bits)\n", file
);
192 fputs_filtered ("Extended Precision (64-bits)\n", file
);
196 fputs_filtered (" RC: ", file
);
197 switch ((control
>> 10) & 3)
200 fputs_filtered ("Round to nearest\n", file
);
203 fputs_filtered ("Round down\n", file
);
206 fputs_filtered ("Round up\n", file
);
209 fputs_filtered ("Round toward zero\n", file
);
214 /* Print out the i387 floating point state. Note that we ignore FRAME
215 in the code below. That's OK since floating-point registers are
216 never saved on the stack. */
219 i387_print_float_info (struct gdbarch
*gdbarch
, struct ui_file
*file
,
220 struct frame_info
*frame
, const char *args
)
222 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_frame_arch (frame
));
244 gdb_assert (gdbarch
== get_frame_arch (frame
));
246 fctrl_p
= read_frame_register_unsigned (frame
,
247 I387_FCTRL_REGNUM (tdep
), &fctrl
);
248 fstat_p
= read_frame_register_unsigned (frame
,
249 I387_FSTAT_REGNUM (tdep
), &fstat
);
250 ftag_p
= read_frame_register_unsigned (frame
,
251 I387_FTAG_REGNUM (tdep
), &ftag
);
252 fiseg_p
= read_frame_register_unsigned (frame
,
253 I387_FISEG_REGNUM (tdep
), &fiseg
);
254 fioff_p
= read_frame_register_unsigned (frame
,
255 I387_FIOFF_REGNUM (tdep
), &fioff
);
256 foseg_p
= read_frame_register_unsigned (frame
,
257 I387_FOSEG_REGNUM (tdep
), &foseg
);
258 fooff_p
= read_frame_register_unsigned (frame
,
259 I387_FOOFF_REGNUM (tdep
), &fooff
);
260 fop_p
= read_frame_register_unsigned (frame
,
261 I387_FOP_REGNUM (tdep
), &fop
);
265 top
= ((fstat
>> 11) & 7);
267 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
269 struct value
*regval
;
274 fprintf_filtered (file
, "%sR%d: ", fpreg
== top
? "=>" : " ", fpreg
);
278 tag
= (ftag
>> (fpreg
* 2)) & 3;
283 fputs_filtered ("Valid ", file
);
286 fputs_filtered ("Zero ", file
);
289 fputs_filtered ("Special ", file
);
292 fputs_filtered ("Empty ", file
);
297 fputs_filtered ("Unknown ", file
);
299 regnum
= (fpreg
+ 8 - top
) % 8 + I387_ST0_REGNUM (tdep
);
300 regval
= get_frame_register_value (frame
, regnum
);
302 if (value_entirely_available (regval
))
304 const char *raw
= value_contents (regval
);
306 fputs_filtered ("0x", file
);
307 for (i
= 9; i
>= 0; i
--)
308 fprintf_filtered (file
, "%02x", raw
[i
]);
310 if (tag
!= -1 && tag
!= 3)
311 print_i387_ext (gdbarch
, raw
, file
);
314 fprintf_filtered (file
, "%s", _("<unavailable>"));
316 fputs_filtered ("\n", file
);
320 fputs_filtered ("\n", file
);
321 print_i387_status_word (fstat_p
, fstat
, file
);
322 print_i387_control_word (fctrl_p
, fctrl
, file
);
323 fprintf_filtered (file
, "Tag Word: %s\n",
324 ftag_p
? hex_string_custom (ftag
, 4) : _("<unavailable>"));
325 fprintf_filtered (file
, "Instruction Pointer: %s:",
326 fiseg_p
? hex_string_custom (fiseg
, 2) : _("<unavailable>"));
327 fprintf_filtered (file
, "%s\n",
328 fioff_p
? hex_string_custom (fioff
, 8) : _("<unavailable>"));
329 fprintf_filtered (file
, "Operand Pointer: %s:",
330 foseg_p
? hex_string_custom (foseg
, 2) : _("<unavailable>"));
331 fprintf_filtered (file
, "%s\n",
332 fooff_p
? hex_string_custom (fooff
, 8) : _("<unavailable>"));
333 fprintf_filtered (file
, "Opcode: %s\n",
335 ? (hex_string_custom (fop
? (fop
| 0xd800) : 0, 4))
336 : _("<unavailable>"));
340 /* Return nonzero if a value of type TYPE stored in register REGNUM
341 needs any special handling. */
344 i387_convert_register_p (struct gdbarch
*gdbarch
, int regnum
,
347 if (i386_fp_regnum_p (gdbarch
, regnum
))
349 /* Floating point registers must be converted unless we are
350 accessing them in their hardware type. */
351 if (type
== i387_ext_type (gdbarch
))
360 /* Read a value of type TYPE from register REGNUM in frame FRAME, and
361 return its contents in TO. */
364 i387_register_to_value (struct frame_info
*frame
, int regnum
,
365 struct type
*type
, gdb_byte
*to
,
366 int *optimizedp
, int *unavailablep
)
368 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
369 gdb_byte from
[I386_MAX_REGISTER_SIZE
];
371 gdb_assert (i386_fp_regnum_p (gdbarch
, regnum
));
373 /* We only support floating-point values. */
374 if (TYPE_CODE (type
) != TYPE_CODE_FLT
)
376 warning (_("Cannot convert floating-point register value "
377 "to non-floating-point type."));
378 *optimizedp
= *unavailablep
= 0;
382 /* Convert to TYPE. */
383 if (!get_frame_register_bytes (frame
, regnum
, 0, TYPE_LENGTH (type
),
384 from
, optimizedp
, unavailablep
))
387 convert_typed_floating (from
, i387_ext_type (gdbarch
), to
, type
);
388 *optimizedp
= *unavailablep
= 0;
392 /* Write the contents FROM of a value of type TYPE into register
393 REGNUM in frame FRAME. */
396 i387_value_to_register (struct frame_info
*frame
, int regnum
,
397 struct type
*type
, const gdb_byte
*from
)
399 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
400 gdb_byte to
[I386_MAX_REGISTER_SIZE
];
402 gdb_assert (i386_fp_regnum_p (gdbarch
, regnum
));
404 /* We only support floating-point values. */
405 if (TYPE_CODE (type
) != TYPE_CODE_FLT
)
407 warning (_("Cannot convert non-floating-point type "
408 "to floating-point register value."));
412 /* Convert from TYPE. */
413 convert_typed_floating (from
, type
, to
, i387_ext_type (gdbarch
));
414 put_frame_register (frame
, regnum
, to
);
418 /* Handle FSAVE and FXSAVE formats. */
420 /* At fsave_offset[REGNUM] you'll find the offset to the location in
421 the data structure used by the "fsave" instruction where GDB
422 register REGNUM is stored. */
424 static int fsave_offset
[] =
426 28 + 0 * 10, /* %st(0) ... */
433 28 + 7 * 10, /* ... %st(7). */
434 0, /* `fctrl' (16 bits). */
435 4, /* `fstat' (16 bits). */
436 8, /* `ftag' (16 bits). */
437 16, /* `fiseg' (16 bits). */
439 24, /* `foseg' (16 bits). */
441 18 /* `fop' (bottom 11 bits). */
444 #define FSAVE_ADDR(tdep, fsave, regnum) \
445 (fsave + fsave_offset[regnum - I387_ST0_REGNUM (tdep)])
448 /* Fill register REGNUM in REGCACHE with the appropriate value from
449 *FSAVE. This function masks off any of the reserved bits in
453 i387_supply_fsave (struct regcache
*regcache
, int regnum
, const void *fsave
)
455 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
456 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
457 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
458 const gdb_byte
*regs
= fsave
;
461 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
463 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_XMM0_REGNUM (tdep
); i
++)
464 if (regnum
== -1 || regnum
== i
)
468 regcache_raw_supply (regcache
, i
, NULL
);
472 /* Most of the FPU control registers occupy only 16 bits in the
473 fsave area. Give those a special treatment. */
474 if (i
>= I387_FCTRL_REGNUM (tdep
)
475 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
479 memcpy (val
, FSAVE_ADDR (tdep
, regs
, i
), 2);
481 if (i
== I387_FOP_REGNUM (tdep
))
482 val
[1] &= ((1 << 3) - 1);
483 regcache_raw_supply (regcache
, i
, val
);
486 regcache_raw_supply (regcache
, i
, FSAVE_ADDR (tdep
, regs
, i
));
489 /* Provide dummy values for the SSE registers. */
490 for (i
= I387_XMM0_REGNUM (tdep
); i
< I387_MXCSR_REGNUM (tdep
); i
++)
491 if (regnum
== -1 || regnum
== i
)
492 regcache_raw_supply (regcache
, i
, NULL
);
493 if (regnum
== -1 || regnum
== I387_MXCSR_REGNUM (tdep
))
497 store_unsigned_integer (buf
, 4, byte_order
, 0x1f80);
498 regcache_raw_supply (regcache
, I387_MXCSR_REGNUM (tdep
), buf
);
502 /* Fill register REGNUM (if it is a floating-point register) in *FSAVE
503 with the value from REGCACHE. If REGNUM is -1, do this for all
504 registers. This function doesn't touch any of the reserved bits in
508 i387_collect_fsave (const struct regcache
*regcache
, int regnum
, void *fsave
)
510 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
511 gdb_byte
*regs
= fsave
;
514 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
516 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_XMM0_REGNUM (tdep
); i
++)
517 if (regnum
== -1 || regnum
== i
)
519 /* Most of the FPU control registers occupy only 16 bits in
520 the fsave area. Give those a special treatment. */
521 if (i
>= I387_FCTRL_REGNUM (tdep
)
522 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
526 regcache_raw_collect (regcache
, i
, buf
);
528 if (i
== I387_FOP_REGNUM (tdep
))
530 /* The opcode occupies only 11 bits. Make sure we
531 don't touch the other bits. */
532 buf
[1] &= ((1 << 3) - 1);
533 buf
[1] |= ((FSAVE_ADDR (tdep
, regs
, i
))[1] & ~((1 << 3) - 1));
535 memcpy (FSAVE_ADDR (tdep
, regs
, i
), buf
, 2);
538 regcache_raw_collect (regcache
, i
, FSAVE_ADDR (tdep
, regs
, i
));
543 /* At fxsave_offset[REGNUM] you'll find the offset to the location in
544 the data structure used by the "fxsave" instruction where GDB
545 register REGNUM is stored. */
547 static int fxsave_offset
[] =
549 32, /* %st(0) through ... */
556 144, /* ... %st(7) (80 bits each). */
557 0, /* `fctrl' (16 bits). */
558 2, /* `fstat' (16 bits). */
559 4, /* `ftag' (16 bits). */
560 12, /* `fiseg' (16 bits). */
562 20, /* `foseg' (16 bits). */
564 6, /* `fop' (bottom 11 bits). */
565 160 + 0 * 16, /* %xmm0 through ... */
580 160 + 15 * 16, /* ... %xmm15 (128 bits each). */
583 #define FXSAVE_ADDR(tdep, fxsave, regnum) \
584 (fxsave + fxsave_offset[regnum - I387_ST0_REGNUM (tdep)])
586 /* We made an unfortunate choice in putting %mxcsr after the SSE
587 registers %xmm0-%xmm7 instead of before, since it makes supporting
588 the registers %xmm8-%xmm15 on AMD64 a bit involved. Therefore we
589 don't include the offset for %mxcsr here above. */
591 #define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24)
593 static int i387_tag (const gdb_byte
*raw
);
596 /* Fill register REGNUM in REGCACHE with the appropriate
597 floating-point or SSE register value from *FXSAVE. This function
598 masks off any of the reserved bits in *FXSAVE. */
601 i387_supply_fxsave (struct regcache
*regcache
, int regnum
, const void *fxsave
)
603 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
604 const gdb_byte
*regs
= fxsave
;
607 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
608 gdb_assert (tdep
->num_xmm_regs
> 0);
610 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_MXCSR_REGNUM (tdep
); i
++)
611 if (regnum
== -1 || regnum
== i
)
615 regcache_raw_supply (regcache
, i
, NULL
);
619 /* Most of the FPU control registers occupy only 16 bits in
620 the fxsave area. Give those a special treatment. */
621 if (i
>= I387_FCTRL_REGNUM (tdep
) && i
< I387_XMM0_REGNUM (tdep
)
622 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
626 memcpy (val
, FXSAVE_ADDR (tdep
, regs
, i
), 2);
628 if (i
== I387_FOP_REGNUM (tdep
))
629 val
[1] &= ((1 << 3) - 1);
630 else if (i
== I387_FTAG_REGNUM (tdep
))
632 /* The fxsave area contains a simplified version of
633 the tag word. We have to look at the actual 80-bit
634 FP data to recreate the traditional i387 tag word. */
636 unsigned long ftag
= 0;
640 top
= ((FXSAVE_ADDR (tdep
, regs
,
641 I387_FSTAT_REGNUM (tdep
)))[1] >> 3);
644 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
648 if (val
[0] & (1 << fpreg
))
650 int thisreg
= (fpreg
+ 8 - top
) % 8
651 + I387_ST0_REGNUM (tdep
);
652 tag
= i387_tag (FXSAVE_ADDR (tdep
, regs
, thisreg
));
657 ftag
|= tag
<< (2 * fpreg
);
659 val
[0] = ftag
& 0xff;
660 val
[1] = (ftag
>> 8) & 0xff;
662 regcache_raw_supply (regcache
, i
, val
);
665 regcache_raw_supply (regcache
, i
, FXSAVE_ADDR (tdep
, regs
, i
));
668 if (regnum
== I387_MXCSR_REGNUM (tdep
) || regnum
== -1)
671 regcache_raw_supply (regcache
, I387_MXCSR_REGNUM (tdep
), NULL
);
673 regcache_raw_supply (regcache
, I387_MXCSR_REGNUM (tdep
),
674 FXSAVE_MXCSR_ADDR (regs
));
678 /* Fill register REGNUM (if it is a floating-point or SSE register) in
679 *FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for
680 all registers. This function doesn't touch any of the reserved
684 i387_collect_fxsave (const struct regcache
*regcache
, int regnum
, void *fxsave
)
686 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
687 gdb_byte
*regs
= fxsave
;
690 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
691 gdb_assert (tdep
->num_xmm_regs
> 0);
693 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_MXCSR_REGNUM (tdep
); i
++)
694 if (regnum
== -1 || regnum
== i
)
696 /* Most of the FPU control registers occupy only 16 bits in
697 the fxsave area. Give those a special treatment. */
698 if (i
>= I387_FCTRL_REGNUM (tdep
) && i
< I387_XMM0_REGNUM (tdep
)
699 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
703 regcache_raw_collect (regcache
, i
, buf
);
705 if (i
== I387_FOP_REGNUM (tdep
))
707 /* The opcode occupies only 11 bits. Make sure we
708 don't touch the other bits. */
709 buf
[1] &= ((1 << 3) - 1);
710 buf
[1] |= ((FXSAVE_ADDR (tdep
, regs
, i
))[1] & ~((1 << 3) - 1));
712 else if (i
== I387_FTAG_REGNUM (tdep
))
714 /* Converting back is much easier. */
719 ftag
= (buf
[1] << 8) | buf
[0];
723 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
725 int tag
= (ftag
>> (fpreg
* 2)) & 3;
728 buf
[0] |= (1 << fpreg
);
731 memcpy (FXSAVE_ADDR (tdep
, regs
, i
), buf
, 2);
734 regcache_raw_collect (regcache
, i
, FXSAVE_ADDR (tdep
, regs
, i
));
737 if (regnum
== I387_MXCSR_REGNUM (tdep
) || regnum
== -1)
738 regcache_raw_collect (regcache
, I387_MXCSR_REGNUM (tdep
),
739 FXSAVE_MXCSR_ADDR (regs
));
742 /* `xstate_bv' is at byte offset 512. */
743 #define XSAVE_XSTATE_BV_ADDR(xsave) (xsave + 512)
745 /* At xsave_avxh_offset[REGNUM] you'll find the offset to the location in
746 the upper 128bit of AVX register data structure used by the "xsave"
747 instruction where GDB register REGNUM is stored. */
749 static int xsave_avxh_offset
[] =
751 576 + 0 * 16, /* Upper 128bit of %ymm0 through ... */
766 576 + 15 * 16 /* Upper 128bit of ... %ymm15 (128 bits each). */
769 #define XSAVE_AVXH_ADDR(tdep, xsave, regnum) \
770 (xsave + xsave_avxh_offset[regnum - I387_YMM0H_REGNUM (tdep)])
772 /* Similar to i387_supply_fxsave, but use XSAVE extended state. */
775 i387_supply_xsave (struct regcache
*regcache
, int regnum
,
778 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
779 const gdb_byte
*regs
= xsave
;
781 unsigned int clear_bv
;
782 static const gdb_byte zero
[MAX_REGISTER_SIZE
] = { 0 };
790 all
= x87
| sse
| avxh
793 gdb_assert (regs
!= NULL
);
794 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
795 gdb_assert (tdep
->num_xmm_regs
> 0);
799 else if (regnum
>= I387_YMM0H_REGNUM (tdep
)
800 && regnum
< I387_YMMENDH_REGNUM (tdep
))
802 else if (regnum
>= I387_XMM0_REGNUM(tdep
)
803 && regnum
< I387_MXCSR_REGNUM (tdep
))
805 else if (regnum
>= I387_ST0_REGNUM (tdep
)
806 && regnum
< I387_FCTRL_REGNUM (tdep
))
811 if (regclass
!= none
)
813 /* Get `xstat_bv'. */
814 const gdb_byte
*xstate_bv_p
= XSAVE_XSTATE_BV_ADDR (regs
);
816 /* The supported bits in `xstat_bv' are 1 byte. Clear part in
817 vector registers if its bit in xstat_bv is zero. */
818 clear_bv
= (~(*xstate_bv_p
)) & tdep
->xcr0
;
821 clear_bv
= I386_XSTATE_AVX_MASK
;
823 /* With the delayed xsave mechanism, in between the program
824 starting, and the program accessing the vector registers for the
825 first time, the register's values are invalid. The kernel
826 initializes register states to zero when they are set the first
827 time in a program. This means that from the user-space programs'
828 perspective, it's the same as if the registers have always been
829 zero from the start of the program. Therefore, the debugger
830 should provide the same illusion to the user. */
838 if ((clear_bv
& I386_XSTATE_AVX
))
839 regcache_raw_supply (regcache
, regnum
, zero
);
841 regcache_raw_supply (regcache
, regnum
,
842 XSAVE_AVXH_ADDR (tdep
, regs
, regnum
));
846 if ((clear_bv
& I386_XSTATE_SSE
))
847 regcache_raw_supply (regcache
, regnum
, zero
);
849 regcache_raw_supply (regcache
, regnum
,
850 FXSAVE_ADDR (tdep
, regs
, regnum
));
854 if ((clear_bv
& I386_XSTATE_X87
))
855 regcache_raw_supply (regcache
, regnum
, zero
);
857 regcache_raw_supply (regcache
, regnum
,
858 FXSAVE_ADDR (tdep
, regs
, regnum
));
862 /* Handle the upper YMM registers. */
863 if ((tdep
->xcr0
& I386_XSTATE_AVX
))
865 if ((clear_bv
& I386_XSTATE_AVX
))
867 for (i
= I387_YMM0H_REGNUM (tdep
);
868 i
< I387_YMMENDH_REGNUM (tdep
);
870 regcache_raw_supply (regcache
, i
, zero
);
874 for (i
= I387_YMM0H_REGNUM (tdep
);
875 i
< I387_YMMENDH_REGNUM (tdep
);
877 regcache_raw_supply (regcache
, i
,
878 XSAVE_AVXH_ADDR (tdep
, regs
, i
));
882 /* Handle the XMM registers. */
883 if ((tdep
->xcr0
& I386_XSTATE_SSE
))
885 if ((clear_bv
& I386_XSTATE_SSE
))
887 for (i
= I387_XMM0_REGNUM (tdep
);
888 i
< I387_MXCSR_REGNUM (tdep
);
890 regcache_raw_supply (regcache
, i
, zero
);
894 for (i
= I387_XMM0_REGNUM (tdep
);
895 i
< I387_MXCSR_REGNUM (tdep
); i
++)
896 regcache_raw_supply (regcache
, i
,
897 FXSAVE_ADDR (tdep
, regs
, i
));
901 /* Handle the x87 registers. */
902 if ((tdep
->xcr0
& I386_XSTATE_X87
))
904 if ((clear_bv
& I386_XSTATE_X87
))
906 for (i
= I387_ST0_REGNUM (tdep
);
907 i
< I387_FCTRL_REGNUM (tdep
);
909 regcache_raw_supply (regcache
, i
, zero
);
913 for (i
= I387_ST0_REGNUM (tdep
);
914 i
< I387_FCTRL_REGNUM (tdep
);
916 regcache_raw_supply (regcache
, i
, FXSAVE_ADDR (tdep
, regs
, i
));
922 /* Only handle x87 control registers. */
923 for (i
= I387_FCTRL_REGNUM (tdep
); i
< I387_XMM0_REGNUM (tdep
); i
++)
924 if (regnum
== -1 || regnum
== i
)
926 /* Most of the FPU control registers occupy only 16 bits in
927 the xsave extended state. Give those a special treatment. */
928 if (i
!= I387_FIOFF_REGNUM (tdep
)
929 && i
!= I387_FOOFF_REGNUM (tdep
))
933 memcpy (val
, FXSAVE_ADDR (tdep
, regs
, i
), 2);
935 if (i
== I387_FOP_REGNUM (tdep
))
936 val
[1] &= ((1 << 3) - 1);
937 else if (i
== I387_FTAG_REGNUM (tdep
))
939 /* The fxsave area contains a simplified version of
940 the tag word. We have to look at the actual 80-bit
941 FP data to recreate the traditional i387 tag word. */
943 unsigned long ftag
= 0;
947 top
= ((FXSAVE_ADDR (tdep
, regs
,
948 I387_FSTAT_REGNUM (tdep
)))[1] >> 3);
951 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
955 if (val
[0] & (1 << fpreg
))
957 int thisreg
= (fpreg
+ 8 - top
) % 8
958 + I387_ST0_REGNUM (tdep
);
959 tag
= i387_tag (FXSAVE_ADDR (tdep
, regs
, thisreg
));
964 ftag
|= tag
<< (2 * fpreg
);
966 val
[0] = ftag
& 0xff;
967 val
[1] = (ftag
>> 8) & 0xff;
969 regcache_raw_supply (regcache
, i
, val
);
972 regcache_raw_supply (regcache
, i
, FXSAVE_ADDR (tdep
, regs
, i
));
975 if (regnum
== I387_MXCSR_REGNUM (tdep
) || regnum
== -1)
976 regcache_raw_supply (regcache
, I387_MXCSR_REGNUM (tdep
),
977 FXSAVE_MXCSR_ADDR (regs
));
980 /* Similar to i387_collect_fxsave, but use XSAVE extended state. */
983 i387_collect_xsave (const struct regcache
*regcache
, int regnum
,
984 void *xsave
, int gcore
)
986 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
987 gdb_byte
*regs
= xsave
;
996 all
= x87
| sse
| avxh
999 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
1000 gdb_assert (tdep
->num_xmm_regs
> 0);
1004 else if (regnum
>= I387_YMM0H_REGNUM (tdep
)
1005 && regnum
< I387_YMMENDH_REGNUM (tdep
))
1007 else if (regnum
>= I387_XMM0_REGNUM(tdep
)
1008 && regnum
< I387_MXCSR_REGNUM (tdep
))
1010 else if (regnum
>= I387_ST0_REGNUM (tdep
)
1011 && regnum
< I387_FCTRL_REGNUM (tdep
))
1018 /* Clear XSAVE extended state. */
1019 memset (regs
, 0, I386_XSTATE_SIZE (tdep
->xcr0
));
1021 /* Update XCR0 and `xstate_bv' with XCR0 for gcore. */
1022 if (tdep
->xsave_xcr0_offset
!= -1)
1023 memcpy (regs
+ tdep
->xsave_xcr0_offset
, &tdep
->xcr0
, 8);
1024 memcpy (XSAVE_XSTATE_BV_ADDR (regs
), &tdep
->xcr0
, 8);
1027 if ((regclass
& check
))
1029 gdb_byte raw
[I386_MAX_REGISTER_SIZE
];
1030 gdb_byte
*xstate_bv_p
= XSAVE_XSTATE_BV_ADDR (regs
);
1031 unsigned int xstate_bv
= 0;
1032 /* The supported bits in `xstat_bv' are 1 byte. */
1033 unsigned int clear_bv
= (~(*xstate_bv_p
)) & tdep
->xcr0
;
1036 /* Clear register set if its bit in xstat_bv is zero. */
1039 if ((clear_bv
& I386_XSTATE_AVX
))
1040 for (i
= I387_YMM0H_REGNUM (tdep
);
1041 i
< I387_YMMENDH_REGNUM (tdep
); i
++)
1042 memset (XSAVE_AVXH_ADDR (tdep
, regs
, i
), 0, 16);
1044 if ((clear_bv
& I386_XSTATE_SSE
))
1045 for (i
= I387_XMM0_REGNUM (tdep
);
1046 i
< I387_MXCSR_REGNUM (tdep
); i
++)
1047 memset (FXSAVE_ADDR (tdep
, regs
, i
), 0, 16);
1049 if ((clear_bv
& I386_XSTATE_X87
))
1050 for (i
= I387_ST0_REGNUM (tdep
);
1051 i
< I387_FCTRL_REGNUM (tdep
); i
++)
1052 memset (FXSAVE_ADDR (tdep
, regs
, i
), 0, 10);
1055 if (regclass
== all
)
1057 /* Check if any upper YMM registers are changed. */
1058 if ((tdep
->xcr0
& I386_XSTATE_AVX
))
1059 for (i
= I387_YMM0H_REGNUM (tdep
);
1060 i
< I387_YMMENDH_REGNUM (tdep
); i
++)
1062 regcache_raw_collect (regcache
, i
, raw
);
1063 p
= XSAVE_AVXH_ADDR (tdep
, regs
, i
);
1064 if (memcmp (raw
, p
, 16))
1066 xstate_bv
|= I386_XSTATE_AVX
;
1067 memcpy (p
, raw
, 16);
1071 /* Check if any SSE registers are changed. */
1072 if ((tdep
->xcr0
& I386_XSTATE_SSE
))
1073 for (i
= I387_XMM0_REGNUM (tdep
);
1074 i
< I387_MXCSR_REGNUM (tdep
); i
++)
1076 regcache_raw_collect (regcache
, i
, raw
);
1077 p
= FXSAVE_ADDR (tdep
, regs
, i
);
1078 if (memcmp (raw
, p
, 16))
1080 xstate_bv
|= I386_XSTATE_SSE
;
1081 memcpy (p
, raw
, 16);
1085 /* Check if any X87 registers are changed. */
1086 if ((tdep
->xcr0
& I386_XSTATE_X87
))
1087 for (i
= I387_ST0_REGNUM (tdep
);
1088 i
< I387_FCTRL_REGNUM (tdep
); i
++)
1090 regcache_raw_collect (regcache
, i
, raw
);
1091 p
= FXSAVE_ADDR (tdep
, regs
, i
);
1092 if (memcmp (raw
, p
, 10))
1094 xstate_bv
|= I386_XSTATE_X87
;
1095 memcpy (p
, raw
, 10);
1101 /* Check if REGNUM is changed. */
1102 regcache_raw_collect (regcache
, regnum
, raw
);
1107 internal_error (__FILE__
, __LINE__
,
1108 _("invalid i387 regclass"));
1111 /* This is an upper YMM register. */
1112 p
= XSAVE_AVXH_ADDR (tdep
, regs
, regnum
);
1113 if (memcmp (raw
, p
, 16))
1115 xstate_bv
|= I386_XSTATE_AVX
;
1116 memcpy (p
, raw
, 16);
1121 /* This is an SSE register. */
1122 p
= FXSAVE_ADDR (tdep
, regs
, regnum
);
1123 if (memcmp (raw
, p
, 16))
1125 xstate_bv
|= I386_XSTATE_SSE
;
1126 memcpy (p
, raw
, 16);
1131 /* This is an x87 register. */
1132 p
= FXSAVE_ADDR (tdep
, regs
, regnum
);
1133 if (memcmp (raw
, p
, 10))
1135 xstate_bv
|= I386_XSTATE_X87
;
1136 memcpy (p
, raw
, 10);
1142 /* Update the corresponding bits in `xstate_bv' if any SSE/AVX
1143 registers are changed. */
1146 /* The supported bits in `xstat_bv' are 1 byte. */
1147 *xstate_bv_p
|= (gdb_byte
) xstate_bv
;
1152 internal_error (__FILE__
, __LINE__
,
1153 _("invalid i387 regclass"));
1161 /* Register REGNUM has been updated. Return. */
1167 /* Return if REGNUM isn't changed. */
1168 if (regclass
!= all
)
1173 /* Only handle x87 control registers. */
1174 for (i
= I387_FCTRL_REGNUM (tdep
); i
< I387_XMM0_REGNUM (tdep
); i
++)
1175 if (regnum
== -1 || regnum
== i
)
1177 /* Most of the FPU control registers occupy only 16 bits in
1178 the xsave extended state. Give those a special treatment. */
1179 if (i
!= I387_FIOFF_REGNUM (tdep
)
1180 && i
!= I387_FOOFF_REGNUM (tdep
))
1184 regcache_raw_collect (regcache
, i
, buf
);
1186 if (i
== I387_FOP_REGNUM (tdep
))
1188 /* The opcode occupies only 11 bits. Make sure we
1189 don't touch the other bits. */
1190 buf
[1] &= ((1 << 3) - 1);
1191 buf
[1] |= ((FXSAVE_ADDR (tdep
, regs
, i
))[1] & ~((1 << 3) - 1));
1193 else if (i
== I387_FTAG_REGNUM (tdep
))
1195 /* Converting back is much easier. */
1197 unsigned short ftag
;
1200 ftag
= (buf
[1] << 8) | buf
[0];
1204 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
1206 int tag
= (ftag
>> (fpreg
* 2)) & 3;
1209 buf
[0] |= (1 << fpreg
);
1212 memcpy (FXSAVE_ADDR (tdep
, regs
, i
), buf
, 2);
1215 regcache_raw_collect (regcache
, i
, FXSAVE_ADDR (tdep
, regs
, i
));
1218 if (regnum
== I387_MXCSR_REGNUM (tdep
) || regnum
== -1)
1219 regcache_raw_collect (regcache
, I387_MXCSR_REGNUM (tdep
),
1220 FXSAVE_MXCSR_ADDR (regs
));
1223 /* Recreate the FTW (tag word) valid bits from the 80-bit FP data in
1227 i387_tag (const gdb_byte
*raw
)
1230 unsigned int exponent
;
1231 unsigned long fraction
[2];
1233 integer
= raw
[7] & 0x80;
1234 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
1235 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
1236 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
1237 | (raw
[5] << 8) | raw
[4]);
1239 if (exponent
== 0x7fff)
1244 else if (exponent
== 0x0000)
1246 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
1272 /* Prepare the FPU stack in REGCACHE for a function return. */
1275 i387_return_value (struct gdbarch
*gdbarch
, struct regcache
*regcache
)
1277 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1280 /* Set the top of the floating-point register stack to 7. The
1281 actual value doesn't really matter, but 7 is what a normal
1282 function return would end up with if the program started out with
1283 a freshly initialized FPU. */
1284 regcache_raw_read_unsigned (regcache
, I387_FSTAT_REGNUM (tdep
), &fstat
);
1286 regcache_raw_write_unsigned (regcache
, I387_FSTAT_REGNUM (tdep
), fstat
);
1288 /* Mark %st(1) through %st(7) as empty. Since we set the top of the
1289 floating-point register stack to 7, the appropriate value for the
1290 tag word is 0x3fff. */
1291 regcache_raw_write_unsigned (regcache
, I387_FTAG_REGNUM (tdep
), 0x3fff);