1 /* Intel 387 floating point stuff.
3 Copyright (C) 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001,
4 2002, 2003, 2004, 2005, 2007, 2008, 2009 Free 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"
37 /* Print the floating point number specified by RAW. */
40 print_i387_value (struct gdbarch
*gdbarch
,
41 const gdb_byte
*raw
, struct ui_file
*file
)
45 /* Using extract_typed_floating here might affect the representation
46 of certain numbers such as NaNs, even if GDB is running natively.
47 This is fine since our caller already detects such special
48 numbers and we print the hexadecimal representation anyway. */
49 value
= extract_typed_floating (raw
, i387_ext_type (gdbarch
));
51 /* We try to print 19 digits. The last digit may or may not contain
52 garbage, but we'd better print one too many. We need enough room
53 to print the value, 1 position for the sign, 1 for the decimal
54 point, 19 for the digits and 6 for the exponent adds up to 27. */
55 #ifdef PRINTF_HAS_LONG_DOUBLE
56 fprintf_filtered (file
, " %-+27.19Lg", (long double) value
);
58 fprintf_filtered (file
, " %-+27.19g", (double) value
);
62 /* Print the classification for the register contents RAW. */
65 print_i387_ext (struct gdbarch
*gdbarch
,
66 const gdb_byte
*raw
, struct ui_file
*file
)
70 unsigned int exponent
;
71 unsigned long fraction
[2];
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]);
80 if (exponent
== 0x7fff && integer
)
82 if (fraction
[0] == 0x00000000 && fraction
[1] == 0x00000000)
84 fprintf_filtered (file
, " %cInf", (sign
? '-' : '+'));
85 else if (sign
&& fraction
[0] == 0x00000000 && fraction
[1] == 0x40000000)
86 /* Real Indefinite (QNaN). */
87 fputs_unfiltered (" Real Indefinite (QNaN)", file
);
88 else if (fraction
[1] & 0x40000000)
90 fputs_filtered (" QNaN", file
);
93 fputs_filtered (" SNaN", file
);
95 else if (exponent
< 0x7fff && exponent
> 0x0000 && integer
)
97 print_i387_value (gdbarch
, raw
, file
);
98 else if (exponent
== 0x0000)
100 /* Denormal or zero. */
101 print_i387_value (gdbarch
, raw
, file
);
104 /* Pseudo-denormal. */
105 fputs_filtered (" Pseudo-denormal", file
);
106 else if (fraction
[0] || fraction
[1])
108 fputs_filtered (" Denormal", file
);
112 fputs_filtered (" Unsupported", file
);
115 /* Print the status word STATUS. */
118 print_i387_status_word (unsigned int status
, struct ui_file
*file
)
120 fprintf_filtered (file
, "Status Word: %s",
121 hex_string_custom (status
, 4));
122 fputs_filtered (" ", file
);
123 fprintf_filtered (file
, " %s", (status
& 0x0001) ? "IE" : " ");
124 fprintf_filtered (file
, " %s", (status
& 0x0002) ? "DE" : " ");
125 fprintf_filtered (file
, " %s", (status
& 0x0004) ? "ZE" : " ");
126 fprintf_filtered (file
, " %s", (status
& 0x0008) ? "OE" : " ");
127 fprintf_filtered (file
, " %s", (status
& 0x0010) ? "UE" : " ");
128 fprintf_filtered (file
, " %s", (status
& 0x0020) ? "PE" : " ");
129 fputs_filtered (" ", file
);
130 fprintf_filtered (file
, " %s", (status
& 0x0080) ? "ES" : " ");
131 fputs_filtered (" ", file
);
132 fprintf_filtered (file
, " %s", (status
& 0x0040) ? "SF" : " ");
133 fputs_filtered (" ", file
);
134 fprintf_filtered (file
, " %s", (status
& 0x0100) ? "C0" : " ");
135 fprintf_filtered (file
, " %s", (status
& 0x0200) ? "C1" : " ");
136 fprintf_filtered (file
, " %s", (status
& 0x0400) ? "C2" : " ");
137 fprintf_filtered (file
, " %s", (status
& 0x4000) ? "C3" : " ");
139 fputs_filtered ("\n", file
);
141 fprintf_filtered (file
,
142 " TOP: %d\n", ((status
>> 11) & 7));
145 /* Print the control word CONTROL. */
148 print_i387_control_word (unsigned int control
, struct ui_file
*file
)
150 fprintf_filtered (file
, "Control Word: %s",
151 hex_string_custom (control
, 4));
152 fputs_filtered (" ", file
);
153 fprintf_filtered (file
, " %s", (control
& 0x0001) ? "IM" : " ");
154 fprintf_filtered (file
, " %s", (control
& 0x0002) ? "DM" : " ");
155 fprintf_filtered (file
, " %s", (control
& 0x0004) ? "ZM" : " ");
156 fprintf_filtered (file
, " %s", (control
& 0x0008) ? "OM" : " ");
157 fprintf_filtered (file
, " %s", (control
& 0x0010) ? "UM" : " ");
158 fprintf_filtered (file
, " %s", (control
& 0x0020) ? "PM" : " ");
160 fputs_filtered ("\n", file
);
162 fputs_filtered (" PC: ", file
);
163 switch ((control
>> 8) & 3)
166 fputs_filtered ("Single Precision (24-bits)\n", file
);
169 fputs_filtered ("Reserved\n", file
);
172 fputs_filtered ("Double Precision (53-bits)\n", file
);
175 fputs_filtered ("Extended Precision (64-bits)\n", file
);
179 fputs_filtered (" RC: ", file
);
180 switch ((control
>> 10) & 3)
183 fputs_filtered ("Round to nearest\n", file
);
186 fputs_filtered ("Round down\n", file
);
189 fputs_filtered ("Round up\n", file
);
192 fputs_filtered ("Round toward zero\n", file
);
197 /* Print out the i387 floating point state. Note that we ignore FRAME
198 in the code below. That's OK since floating-point registers are
199 never saved on the stack. */
202 i387_print_float_info (struct gdbarch
*gdbarch
, struct ui_file
*file
,
203 struct frame_info
*frame
, const char *args
)
205 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_frame_arch (frame
));
218 gdb_assert (gdbarch
== get_frame_arch (frame
));
220 fctrl
= get_frame_register_unsigned (frame
, I387_FCTRL_REGNUM (tdep
));
221 fstat
= get_frame_register_unsigned (frame
, I387_FSTAT_REGNUM (tdep
));
222 ftag
= get_frame_register_unsigned (frame
, I387_FTAG_REGNUM (tdep
));
223 fiseg
= get_frame_register_unsigned (frame
, I387_FISEG_REGNUM (tdep
));
224 fioff
= get_frame_register_unsigned (frame
, I387_FIOFF_REGNUM (tdep
));
225 foseg
= get_frame_register_unsigned (frame
, I387_FOSEG_REGNUM (tdep
));
226 fooff
= get_frame_register_unsigned (frame
, I387_FOOFF_REGNUM (tdep
));
227 fop
= get_frame_register_unsigned (frame
, I387_FOP_REGNUM (tdep
));
229 top
= ((fstat
>> 11) & 7);
231 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
233 gdb_byte raw
[I386_MAX_REGISTER_SIZE
];
234 int tag
= (ftag
>> (fpreg
* 2)) & 3;
237 fprintf_filtered (file
, "%sR%d: ", fpreg
== top
? "=>" : " ", fpreg
);
242 fputs_filtered ("Valid ", file
);
245 fputs_filtered ("Zero ", file
);
248 fputs_filtered ("Special ", file
);
251 fputs_filtered ("Empty ", file
);
255 get_frame_register (frame
, (fpreg
+ 8 - top
) % 8 + I387_ST0_REGNUM (tdep
),
258 fputs_filtered ("0x", file
);
259 for (i
= 9; i
>= 0; i
--)
260 fprintf_filtered (file
, "%02x", raw
[i
]);
263 print_i387_ext (gdbarch
, raw
, file
);
265 fputs_filtered ("\n", file
);
268 fputs_filtered ("\n", file
);
270 print_i387_status_word (fstat
, file
);
271 print_i387_control_word (fctrl
, file
);
272 fprintf_filtered (file
, "Tag Word: %s\n",
273 hex_string_custom (ftag
, 4));
274 fprintf_filtered (file
, "Instruction Pointer: %s:",
275 hex_string_custom (fiseg
, 2));
276 fprintf_filtered (file
, "%s\n", hex_string_custom (fioff
, 8));
277 fprintf_filtered (file
, "Operand Pointer: %s:",
278 hex_string_custom (foseg
, 2));
279 fprintf_filtered (file
, "%s\n", hex_string_custom (fooff
, 8));
280 fprintf_filtered (file
, "Opcode: %s\n",
281 hex_string_custom (fop
? (fop
| 0xd800) : 0, 4));
285 /* Return nonzero if a value of type TYPE stored in register REGNUM
286 needs any special handling. */
289 i387_convert_register_p (struct gdbarch
*gdbarch
, int regnum
, struct type
*type
)
291 if (i386_fp_regnum_p (gdbarch
, regnum
))
293 /* Floating point registers must be converted unless we are
294 accessing them in their hardware type. */
295 if (type
== i387_ext_type (gdbarch
))
304 /* Read a value of type TYPE from register REGNUM in frame FRAME, and
305 return its contents in TO. */
308 i387_register_to_value (struct frame_info
*frame
, int regnum
,
309 struct type
*type
, gdb_byte
*to
)
311 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
312 gdb_byte from
[I386_MAX_REGISTER_SIZE
];
314 gdb_assert (i386_fp_regnum_p (gdbarch
, regnum
));
316 /* We only support floating-point values. */
317 if (TYPE_CODE (type
) != TYPE_CODE_FLT
)
319 warning (_("Cannot convert floating-point register value "
320 "to non-floating-point type."));
324 /* Convert to TYPE. */
325 get_frame_register (frame
, regnum
, from
);
326 convert_typed_floating (from
, i387_ext_type (gdbarch
), to
, type
);
329 /* Write the contents FROM of a value of type TYPE into register
330 REGNUM in frame FRAME. */
333 i387_value_to_register (struct frame_info
*frame
, int regnum
,
334 struct type
*type
, const gdb_byte
*from
)
336 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
337 gdb_byte to
[I386_MAX_REGISTER_SIZE
];
339 gdb_assert (i386_fp_regnum_p (gdbarch
, regnum
));
341 /* We only support floating-point values. */
342 if (TYPE_CODE (type
) != TYPE_CODE_FLT
)
344 warning (_("Cannot convert non-floating-point type "
345 "to floating-point register value."));
349 /* Convert from TYPE. */
350 convert_typed_floating (from
, type
, to
, i387_ext_type (gdbarch
));
351 put_frame_register (frame
, regnum
, to
);
355 /* Handle FSAVE and FXSAVE formats. */
357 /* At fsave_offset[REGNUM] you'll find the offset to the location in
358 the data structure used by the "fsave" instruction where GDB
359 register REGNUM is stored. */
361 static int fsave_offset
[] =
363 28 + 0 * 10, /* %st(0) ... */
370 28 + 7 * 10, /* ... %st(7). */
371 0, /* `fctrl' (16 bits). */
372 4, /* `fstat' (16 bits). */
373 8, /* `ftag' (16 bits). */
374 16, /* `fiseg' (16 bits). */
376 24, /* `foseg' (16 bits). */
378 18 /* `fop' (bottom 11 bits). */
381 #define FSAVE_ADDR(tdep, fsave, regnum) \
382 (fsave + fsave_offset[regnum - I387_ST0_REGNUM (tdep)])
385 /* Fill register REGNUM in REGCACHE with the appropriate value from
386 *FSAVE. This function masks off any of the reserved bits in
390 i387_supply_fsave (struct regcache
*regcache
, int regnum
, const void *fsave
)
392 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
393 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
394 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
395 const gdb_byte
*regs
= fsave
;
398 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
400 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_XMM0_REGNUM (tdep
); i
++)
401 if (regnum
== -1 || regnum
== i
)
405 regcache_raw_supply (regcache
, i
, NULL
);
409 /* Most of the FPU control registers occupy only 16 bits in the
410 fsave area. Give those a special treatment. */
411 if (i
>= I387_FCTRL_REGNUM (tdep
)
412 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
416 memcpy (val
, FSAVE_ADDR (tdep
, regs
, i
), 2);
418 if (i
== I387_FOP_REGNUM (tdep
))
419 val
[1] &= ((1 << 3) - 1);
420 regcache_raw_supply (regcache
, i
, val
);
423 regcache_raw_supply (regcache
, i
, FSAVE_ADDR (tdep
, regs
, i
));
426 /* Provide dummy values for the SSE registers. */
427 for (i
= I387_XMM0_REGNUM (tdep
); i
< I387_MXCSR_REGNUM (tdep
); i
++)
428 if (regnum
== -1 || regnum
== i
)
429 regcache_raw_supply (regcache
, i
, NULL
);
430 if (regnum
== -1 || regnum
== I387_MXCSR_REGNUM (tdep
))
434 store_unsigned_integer (buf
, 4, byte_order
, 0x1f80);
435 regcache_raw_supply (regcache
, I387_MXCSR_REGNUM (tdep
), buf
);
439 /* Fill register REGNUM (if it is a floating-point register) in *FSAVE
440 with the value from REGCACHE. If REGNUM is -1, do this for all
441 registers. This function doesn't touch any of the reserved bits in
445 i387_collect_fsave (const struct regcache
*regcache
, int regnum
, void *fsave
)
447 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
448 gdb_byte
*regs
= fsave
;
451 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
453 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_XMM0_REGNUM (tdep
); i
++)
454 if (regnum
== -1 || regnum
== i
)
456 /* Most of the FPU control registers occupy only 16 bits in
457 the fsave area. Give those a special treatment. */
458 if (i
>= I387_FCTRL_REGNUM (tdep
)
459 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
463 regcache_raw_collect (regcache
, i
, buf
);
465 if (i
== I387_FOP_REGNUM (tdep
))
467 /* The opcode occupies only 11 bits. Make sure we
468 don't touch the other bits. */
469 buf
[1] &= ((1 << 3) - 1);
470 buf
[1] |= ((FSAVE_ADDR (tdep
, regs
, i
))[1] & ~((1 << 3) - 1));
472 memcpy (FSAVE_ADDR (tdep
, regs
, i
), buf
, 2);
475 regcache_raw_collect (regcache
, i
, FSAVE_ADDR (tdep
, regs
, i
));
480 /* At fxsave_offset[REGNUM] you'll find the offset to the location in
481 the data structure used by the "fxsave" instruction where GDB
482 register REGNUM is stored. */
484 static int fxsave_offset
[] =
486 32, /* %st(0) through ... */
493 144, /* ... %st(7) (80 bits each). */
494 0, /* `fctrl' (16 bits). */
495 2, /* `fstat' (16 bits). */
496 4, /* `ftag' (16 bits). */
497 12, /* `fiseg' (16 bits). */
499 20, /* `foseg' (16 bits). */
501 6, /* `fop' (bottom 11 bits). */
502 160 + 0 * 16, /* %xmm0 through ... */
517 160 + 15 * 16, /* ... %xmm15 (128 bits each). */
520 #define FXSAVE_ADDR(tdep, fxsave, regnum) \
521 (fxsave + fxsave_offset[regnum - I387_ST0_REGNUM (tdep)])
523 /* We made an unfortunate choice in putting %mxcsr after the SSE
524 registers %xmm0-%xmm7 instead of before, since it makes supporting
525 the registers %xmm8-%xmm15 on AMD64 a bit involved. Therefore we
526 don't include the offset for %mxcsr here above. */
528 #define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24)
530 static int i387_tag (const gdb_byte
*raw
);
533 /* Fill register REGNUM in REGCACHE with the appropriate
534 floating-point or SSE register value from *FXSAVE. This function
535 masks off any of the reserved bits in *FXSAVE. */
538 i387_supply_fxsave (struct regcache
*regcache
, int regnum
, const void *fxsave
)
540 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
541 const gdb_byte
*regs
= fxsave
;
544 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
545 gdb_assert (tdep
->num_xmm_regs
> 0);
547 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_MXCSR_REGNUM (tdep
); i
++)
548 if (regnum
== -1 || regnum
== i
)
552 regcache_raw_supply (regcache
, i
, NULL
);
556 /* Most of the FPU control registers occupy only 16 bits in
557 the fxsave area. Give those a special treatment. */
558 if (i
>= I387_FCTRL_REGNUM (tdep
) && i
< I387_XMM0_REGNUM (tdep
)
559 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
563 memcpy (val
, FXSAVE_ADDR (tdep
, regs
, i
), 2);
565 if (i
== I387_FOP_REGNUM (tdep
))
566 val
[1] &= ((1 << 3) - 1);
567 else if (i
== I387_FTAG_REGNUM (tdep
))
569 /* The fxsave area contains a simplified version of
570 the tag word. We have to look at the actual 80-bit
571 FP data to recreate the traditional i387 tag word. */
573 unsigned long ftag
= 0;
577 top
= ((FXSAVE_ADDR (tdep
, regs
,
578 I387_FSTAT_REGNUM (tdep
)))[1] >> 3);
581 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
585 if (val
[0] & (1 << fpreg
))
587 int regnum
= (fpreg
+ 8 - top
) % 8
588 + I387_ST0_REGNUM (tdep
);
589 tag
= i387_tag (FXSAVE_ADDR (tdep
, regs
, regnum
));
594 ftag
|= tag
<< (2 * fpreg
);
596 val
[0] = ftag
& 0xff;
597 val
[1] = (ftag
>> 8) & 0xff;
599 regcache_raw_supply (regcache
, i
, val
);
602 regcache_raw_supply (regcache
, i
, FXSAVE_ADDR (tdep
, regs
, i
));
605 if (regnum
== I387_MXCSR_REGNUM (tdep
) || regnum
== -1)
608 regcache_raw_supply (regcache
, I387_MXCSR_REGNUM (tdep
), NULL
);
610 regcache_raw_supply (regcache
, I387_MXCSR_REGNUM (tdep
),
611 FXSAVE_MXCSR_ADDR (regs
));
615 /* Fill register REGNUM (if it is a floating-point or SSE register) in
616 *FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for
617 all registers. This function doesn't touch any of the reserved
621 i387_collect_fxsave (const struct regcache
*regcache
, int regnum
, void *fxsave
)
623 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
624 gdb_byte
*regs
= fxsave
;
627 gdb_assert (tdep
->st0_regnum
>= I386_ST0_REGNUM
);
628 gdb_assert (tdep
->num_xmm_regs
> 0);
630 for (i
= I387_ST0_REGNUM (tdep
); i
< I387_MXCSR_REGNUM (tdep
); i
++)
631 if (regnum
== -1 || regnum
== i
)
633 /* Most of the FPU control registers occupy only 16 bits in
634 the fxsave area. Give those a special treatment. */
635 if (i
>= I387_FCTRL_REGNUM (tdep
) && i
< I387_XMM0_REGNUM (tdep
)
636 && i
!= I387_FIOFF_REGNUM (tdep
) && i
!= I387_FOOFF_REGNUM (tdep
))
640 regcache_raw_collect (regcache
, i
, buf
);
642 if (i
== I387_FOP_REGNUM (tdep
))
644 /* The opcode occupies only 11 bits. Make sure we
645 don't touch the other bits. */
646 buf
[1] &= ((1 << 3) - 1);
647 buf
[1] |= ((FXSAVE_ADDR (tdep
, regs
, i
))[1] & ~((1 << 3) - 1));
649 else if (i
== I387_FTAG_REGNUM (tdep
))
651 /* Converting back is much easier. */
656 ftag
= (buf
[1] << 8) | buf
[0];
660 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
662 int tag
= (ftag
>> (fpreg
* 2)) & 3;
665 buf
[0] |= (1 << fpreg
);
668 memcpy (FXSAVE_ADDR (tdep
, regs
, i
), buf
, 2);
671 regcache_raw_collect (regcache
, i
, FXSAVE_ADDR (tdep
, regs
, i
));
674 if (regnum
== I387_MXCSR_REGNUM (tdep
) || regnum
== -1)
675 regcache_raw_collect (regcache
, I387_MXCSR_REGNUM (tdep
),
676 FXSAVE_MXCSR_ADDR (regs
));
679 /* Recreate the FTW (tag word) valid bits from the 80-bit FP data in
683 i387_tag (const gdb_byte
*raw
)
686 unsigned int exponent
;
687 unsigned long fraction
[2];
689 integer
= raw
[7] & 0x80;
690 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
691 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
692 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
693 | (raw
[5] << 8) | raw
[4]);
695 if (exponent
== 0x7fff)
700 else if (exponent
== 0x0000)
702 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
728 /* Prepare the FPU stack in REGCACHE for a function return. */
731 i387_return_value (struct gdbarch
*gdbarch
, struct regcache
*regcache
)
733 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
736 /* Set the top of the floating-point register stack to 7. The
737 actual value doesn't really matter, but 7 is what a normal
738 function return would end up with if the program started out with
739 a freshly initialized FPU. */
740 regcache_raw_read_unsigned (regcache
, I387_FSTAT_REGNUM (tdep
), &fstat
);
742 regcache_raw_write_unsigned (regcache
, I387_FSTAT_REGNUM (tdep
), fstat
);
744 /* Mark %st(1) through %st(7) as empty. Since we set the top of the
745 floating-point register stack to 7, the appropriate value for the
746 tag word is 0x3fff. */
747 regcache_raw_write_unsigned (regcache
, I387_FTAG_REGNUM (tdep
), 0x3fff);
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