1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /*---------------------------------------------------------------------------+ |
3 | | reg_ld_str.c | |
4 | | | |
5 | | All of the functions which transfer data between user memory and FPU_REGs.| |
6 | | | |
7 | | Copyright (C) 1992,1993,1994,1996,1997 | |
8 | | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia | |
9 | | E-mail billm@suburbia.net | |
10 | | | |
11 | | | |
12 | +---------------------------------------------------------------------------*/ |
13 | |
14 | /*---------------------------------------------------------------------------+ |
15 | | Note: | |
16 | | The file contains code which accesses user memory. | |
17 | | Emulator static data may change when user memory is accessed, due to | |
18 | | other processes using the emulator while swapping is in progress. | |
19 | +---------------------------------------------------------------------------*/ |
20 | |
21 | #include "fpu_emu.h" |
22 | |
23 | #include <linux/uaccess.h> |
24 | |
25 | #include "fpu_system.h" |
26 | #include "exception.h" |
27 | #include "reg_constant.h" |
28 | #include "control_w.h" |
29 | #include "status_w.h" |
30 | |
31 | #define DOUBLE_Emax 1023 /* largest valid exponent */ |
32 | #define DOUBLE_Ebias 1023 |
33 | #define DOUBLE_Emin (-1022) /* smallest valid exponent */ |
34 | |
35 | #define SINGLE_Emax 127 /* largest valid exponent */ |
36 | #define SINGLE_Ebias 127 |
37 | #define SINGLE_Emin (-126) /* smallest valid exponent */ |
38 | |
39 | static u_char normalize_no_excep(FPU_REG *r, int exp, int sign) |
40 | { |
41 | u_char tag; |
42 | |
43 | setexponent16(r, exp); |
44 | |
45 | tag = FPU_normalize_nuo(x: r); |
46 | stdexp(r); |
47 | if (sign) |
48 | setnegative(r); |
49 | |
50 | return tag; |
51 | } |
52 | |
53 | int FPU_tagof(FPU_REG *ptr) |
54 | { |
55 | int exp; |
56 | |
57 | exp = exponent16(ptr) & 0x7fff; |
58 | if (exp == 0) { |
59 | if (!(ptr->sigh | ptr->sigl)) { |
60 | return TAG_Zero; |
61 | } |
62 | /* The number is a de-normal or pseudodenormal. */ |
63 | return TAG_Special; |
64 | } |
65 | |
66 | if (exp == 0x7fff) { |
67 | /* Is an Infinity, a NaN, or an unsupported data type. */ |
68 | return TAG_Special; |
69 | } |
70 | |
71 | if (!(ptr->sigh & 0x80000000)) { |
72 | /* Unsupported data type. */ |
73 | /* Valid numbers have the ms bit set to 1. */ |
74 | /* Unnormal. */ |
75 | return TAG_Special; |
76 | } |
77 | |
78 | return TAG_Valid; |
79 | } |
80 | |
81 | /* Get a long double from user memory */ |
82 | int FPU_load_extended(long double __user *s, int stnr) |
83 | { |
84 | FPU_REG *sti_ptr = &st(stnr); |
85 | |
86 | RE_ENTRANT_CHECK_OFF; |
87 | FPU_access_ok(s, 10); |
88 | FPU_copy_from_user(sti_ptr, s, 10); |
89 | RE_ENTRANT_CHECK_ON; |
90 | |
91 | return FPU_tagof(ptr: sti_ptr); |
92 | } |
93 | |
94 | /* Get a double from user memory */ |
95 | int FPU_load_double(double __user *dfloat, FPU_REG *loaded_data) |
96 | { |
97 | int exp, tag, negative; |
98 | unsigned m64, l64; |
99 | |
100 | RE_ENTRANT_CHECK_OFF; |
101 | FPU_access_ok(dfloat, 8); |
102 | FPU_get_user(m64, 1 + (unsigned long __user *)dfloat); |
103 | FPU_get_user(l64, (unsigned long __user *)dfloat); |
104 | RE_ENTRANT_CHECK_ON; |
105 | |
106 | negative = (m64 & 0x80000000) ? SIGN_Negative : SIGN_Positive; |
107 | exp = ((m64 & 0x7ff00000) >> 20) - DOUBLE_Ebias + EXTENDED_Ebias; |
108 | m64 &= 0xfffff; |
109 | if (exp > DOUBLE_Emax + EXTENDED_Ebias) { |
110 | /* Infinity or NaN */ |
111 | if ((m64 == 0) && (l64 == 0)) { |
112 | /* +- infinity */ |
113 | loaded_data->sigh = 0x80000000; |
114 | loaded_data->sigl = 0x00000000; |
115 | exp = EXP_Infinity + EXTENDED_Ebias; |
116 | tag = TAG_Special; |
117 | } else { |
118 | /* Must be a signaling or quiet NaN */ |
119 | exp = EXP_NaN + EXTENDED_Ebias; |
120 | loaded_data->sigh = (m64 << 11) | 0x80000000; |
121 | loaded_data->sigh |= l64 >> 21; |
122 | loaded_data->sigl = l64 << 11; |
123 | tag = TAG_Special; /* The calling function must look for NaNs */ |
124 | } |
125 | } else if (exp < DOUBLE_Emin + EXTENDED_Ebias) { |
126 | /* Zero or de-normal */ |
127 | if ((m64 == 0) && (l64 == 0)) { |
128 | /* Zero */ |
129 | reg_copy(x: &CONST_Z, y: loaded_data); |
130 | exp = 0; |
131 | tag = TAG_Zero; |
132 | } else { |
133 | /* De-normal */ |
134 | loaded_data->sigh = m64 << 11; |
135 | loaded_data->sigh |= l64 >> 21; |
136 | loaded_data->sigl = l64 << 11; |
137 | |
138 | return normalize_no_excep(r: loaded_data, DOUBLE_Emin, |
139 | sign: negative) |
140 | | (denormal_operand() < 0 ? FPU_Exception : 0); |
141 | } |
142 | } else { |
143 | loaded_data->sigh = (m64 << 11) | 0x80000000; |
144 | loaded_data->sigh |= l64 >> 21; |
145 | loaded_data->sigl = l64 << 11; |
146 | |
147 | tag = TAG_Valid; |
148 | } |
149 | |
150 | setexponent16(loaded_data, exp | negative); |
151 | |
152 | return tag; |
153 | } |
154 | |
155 | /* Get a float from user memory */ |
156 | int FPU_load_single(float __user *single, FPU_REG *loaded_data) |
157 | { |
158 | unsigned m32; |
159 | int exp, tag, negative; |
160 | |
161 | RE_ENTRANT_CHECK_OFF; |
162 | FPU_access_ok(single, 4); |
163 | FPU_get_user(m32, (unsigned long __user *)single); |
164 | RE_ENTRANT_CHECK_ON; |
165 | |
166 | negative = (m32 & 0x80000000) ? SIGN_Negative : SIGN_Positive; |
167 | |
168 | if (!(m32 & 0x7fffffff)) { |
169 | /* Zero */ |
170 | reg_copy(x: &CONST_Z, y: loaded_data); |
171 | addexponent(loaded_data, negative); |
172 | return TAG_Zero; |
173 | } |
174 | exp = ((m32 & 0x7f800000) >> 23) - SINGLE_Ebias + EXTENDED_Ebias; |
175 | m32 = (m32 & 0x7fffff) << 8; |
176 | if (exp < SINGLE_Emin + EXTENDED_Ebias) { |
177 | /* De-normals */ |
178 | loaded_data->sigh = m32; |
179 | loaded_data->sigl = 0; |
180 | |
181 | return normalize_no_excep(r: loaded_data, SINGLE_Emin, sign: negative) |
182 | | (denormal_operand() < 0 ? FPU_Exception : 0); |
183 | } else if (exp > SINGLE_Emax + EXTENDED_Ebias) { |
184 | /* Infinity or NaN */ |
185 | if (m32 == 0) { |
186 | /* +- infinity */ |
187 | loaded_data->sigh = 0x80000000; |
188 | loaded_data->sigl = 0x00000000; |
189 | exp = EXP_Infinity + EXTENDED_Ebias; |
190 | tag = TAG_Special; |
191 | } else { |
192 | /* Must be a signaling or quiet NaN */ |
193 | exp = EXP_NaN + EXTENDED_Ebias; |
194 | loaded_data->sigh = m32 | 0x80000000; |
195 | loaded_data->sigl = 0; |
196 | tag = TAG_Special; /* The calling function must look for NaNs */ |
197 | } |
198 | } else { |
199 | loaded_data->sigh = m32 | 0x80000000; |
200 | loaded_data->sigl = 0; |
201 | tag = TAG_Valid; |
202 | } |
203 | |
204 | setexponent16(loaded_data, exp | negative); /* Set the sign. */ |
205 | |
206 | return tag; |
207 | } |
208 | |
209 | /* Get a long long from user memory */ |
210 | int FPU_load_int64(long long __user *_s) |
211 | { |
212 | long long s; |
213 | int sign; |
214 | FPU_REG *st0_ptr = &st(0); |
215 | |
216 | RE_ENTRANT_CHECK_OFF; |
217 | FPU_access_ok(_s, 8); |
218 | if (copy_from_user(to: &s, from: _s, n: 8)) |
219 | FPU_abort; |
220 | RE_ENTRANT_CHECK_ON; |
221 | |
222 | if (s == 0) { |
223 | reg_copy(x: &CONST_Z, y: st0_ptr); |
224 | return TAG_Zero; |
225 | } |
226 | |
227 | if (s > 0) |
228 | sign = SIGN_Positive; |
229 | else { |
230 | s = -s; |
231 | sign = SIGN_Negative; |
232 | } |
233 | |
234 | significand(st0_ptr) = s; |
235 | |
236 | return normalize_no_excep(r: st0_ptr, exp: 63, sign); |
237 | } |
238 | |
239 | /* Get a long from user memory */ |
240 | int FPU_load_int32(long __user *_s, FPU_REG *loaded_data) |
241 | { |
242 | long s; |
243 | int negative; |
244 | |
245 | RE_ENTRANT_CHECK_OFF; |
246 | FPU_access_ok(_s, 4); |
247 | FPU_get_user(s, _s); |
248 | RE_ENTRANT_CHECK_ON; |
249 | |
250 | if (s == 0) { |
251 | reg_copy(x: &CONST_Z, y: loaded_data); |
252 | return TAG_Zero; |
253 | } |
254 | |
255 | if (s > 0) |
256 | negative = SIGN_Positive; |
257 | else { |
258 | s = -s; |
259 | negative = SIGN_Negative; |
260 | } |
261 | |
262 | loaded_data->sigh = s; |
263 | loaded_data->sigl = 0; |
264 | |
265 | return normalize_no_excep(r: loaded_data, exp: 31, sign: negative); |
266 | } |
267 | |
268 | /* Get a short from user memory */ |
269 | int FPU_load_int16(short __user *_s, FPU_REG *loaded_data) |
270 | { |
271 | int s, negative; |
272 | |
273 | RE_ENTRANT_CHECK_OFF; |
274 | FPU_access_ok(_s, 2); |
275 | /* Cast as short to get the sign extended. */ |
276 | FPU_get_user(s, _s); |
277 | RE_ENTRANT_CHECK_ON; |
278 | |
279 | if (s == 0) { |
280 | reg_copy(x: &CONST_Z, y: loaded_data); |
281 | return TAG_Zero; |
282 | } |
283 | |
284 | if (s > 0) |
285 | negative = SIGN_Positive; |
286 | else { |
287 | s = -s; |
288 | negative = SIGN_Negative; |
289 | } |
290 | |
291 | loaded_data->sigh = s << 16; |
292 | loaded_data->sigl = 0; |
293 | |
294 | return normalize_no_excep(r: loaded_data, exp: 15, sign: negative); |
295 | } |
296 | |
297 | /* Get a packed bcd array from user memory */ |
298 | int FPU_load_bcd(u_char __user *s) |
299 | { |
300 | FPU_REG *st0_ptr = &st(0); |
301 | int pos; |
302 | u_char bcd; |
303 | long long l = 0; |
304 | int sign; |
305 | |
306 | RE_ENTRANT_CHECK_OFF; |
307 | FPU_access_ok(s, 10); |
308 | RE_ENTRANT_CHECK_ON; |
309 | for (pos = 8; pos >= 0; pos--) { |
310 | l *= 10; |
311 | RE_ENTRANT_CHECK_OFF; |
312 | FPU_get_user(bcd, s + pos); |
313 | RE_ENTRANT_CHECK_ON; |
314 | l += bcd >> 4; |
315 | l *= 10; |
316 | l += bcd & 0x0f; |
317 | } |
318 | |
319 | RE_ENTRANT_CHECK_OFF; |
320 | FPU_get_user(sign, s + 9); |
321 | sign = sign & 0x80 ? SIGN_Negative : SIGN_Positive; |
322 | RE_ENTRANT_CHECK_ON; |
323 | |
324 | if (l == 0) { |
325 | reg_copy(x: &CONST_Z, y: st0_ptr); |
326 | addexponent(st0_ptr, sign); /* Set the sign. */ |
327 | return TAG_Zero; |
328 | } else { |
329 | significand(st0_ptr) = l; |
330 | return normalize_no_excep(r: st0_ptr, exp: 63, sign); |
331 | } |
332 | } |
333 | |
334 | /*===========================================================================*/ |
335 | |
336 | /* Put a long double into user memory */ |
337 | int FPU_store_extended(FPU_REG *st0_ptr, u_char st0_tag, |
338 | long double __user * d) |
339 | { |
340 | /* |
341 | The only exception raised by an attempt to store to an |
342 | extended format is the Invalid Stack exception, i.e. |
343 | attempting to store from an empty register. |
344 | */ |
345 | |
346 | if (st0_tag != TAG_Empty) { |
347 | RE_ENTRANT_CHECK_OFF; |
348 | FPU_access_ok(d, 10); |
349 | |
350 | FPU_put_user(st0_ptr->sigl, (unsigned long __user *)d); |
351 | FPU_put_user(st0_ptr->sigh, |
352 | (unsigned long __user *)((u_char __user *) d + 4)); |
353 | FPU_put_user(exponent16(st0_ptr), |
354 | (unsigned short __user *)((u_char __user *) d + |
355 | 8)); |
356 | RE_ENTRANT_CHECK_ON; |
357 | |
358 | return 1; |
359 | } |
360 | |
361 | /* Empty register (stack underflow) */ |
362 | EXCEPTION(EX_StackUnder); |
363 | if (control_word & CW_Invalid) { |
364 | /* The masked response */ |
365 | /* Put out the QNaN indefinite */ |
366 | RE_ENTRANT_CHECK_OFF; |
367 | FPU_access_ok(d, 10); |
368 | FPU_put_user(0, (unsigned long __user *)d); |
369 | FPU_put_user(0xc0000000, 1 + (unsigned long __user *)d); |
370 | FPU_put_user(0xffff, 4 + (short __user *)d); |
371 | RE_ENTRANT_CHECK_ON; |
372 | return 1; |
373 | } else |
374 | return 0; |
375 | |
376 | } |
377 | |
378 | /* Put a double into user memory */ |
379 | int FPU_store_double(FPU_REG *st0_ptr, u_char st0_tag, double __user *dfloat) |
380 | { |
381 | unsigned long l[2]; |
382 | unsigned long increment = 0; /* avoid gcc warnings */ |
383 | int precision_loss; |
384 | int exp; |
385 | FPU_REG tmp; |
386 | |
387 | l[0] = 0; |
388 | l[1] = 0; |
389 | if (st0_tag == TAG_Valid) { |
390 | reg_copy(x: st0_ptr, y: &tmp); |
391 | exp = exponent(&tmp); |
392 | |
393 | if (exp < DOUBLE_Emin) { /* It may be a denormal */ |
394 | addexponent(&tmp, -DOUBLE_Emin + 52); /* largest exp to be 51 */ |
395 | denormal_arg: |
396 | if ((precision_loss = FPU_round_to_int(r: &tmp, tag: st0_tag))) { |
397 | #ifdef PECULIAR_486 |
398 | /* Did it round to a non-denormal ? */ |
399 | /* This behaviour might be regarded as peculiar, it appears |
400 | that the 80486 rounds to the dest precision, then |
401 | converts to decide underflow. */ |
402 | if (! |
403 | ((tmp.sigh == 0x00100000) && (tmp.sigl == 0) |
404 | && (st0_ptr->sigl & 0x000007ff))) |
405 | #endif /* PECULIAR_486 */ |
406 | { |
407 | EXCEPTION(EX_Underflow); |
408 | /* This is a special case: see sec 16.2.5.1 of |
409 | the 80486 book */ |
410 | if (!(control_word & CW_Underflow)) |
411 | return 0; |
412 | } |
413 | EXCEPTION(precision_loss); |
414 | if (!(control_word & CW_Precision)) |
415 | return 0; |
416 | } |
417 | l[0] = tmp.sigl; |
418 | l[1] = tmp.sigh; |
419 | } else { |
420 | if (tmp.sigl & 0x000007ff) { |
421 | precision_loss = 1; |
422 | switch (control_word & CW_RC) { |
423 | case RC_RND: |
424 | /* Rounding can get a little messy.. */ |
425 | increment = ((tmp.sigl & 0x7ff) > 0x400) | /* nearest */ |
426 | ((tmp.sigl & 0xc00) == 0xc00); /* odd -> even */ |
427 | break; |
428 | case RC_DOWN: /* towards -infinity */ |
429 | increment = |
430 | signpositive(&tmp) ? 0 : tmp. |
431 | sigl & 0x7ff; |
432 | break; |
433 | case RC_UP: /* towards +infinity */ |
434 | increment = |
435 | signpositive(&tmp) ? tmp. |
436 | sigl & 0x7ff : 0; |
437 | break; |
438 | case RC_CHOP: |
439 | increment = 0; |
440 | break; |
441 | } |
442 | |
443 | /* Truncate the mantissa */ |
444 | tmp.sigl &= 0xfffff800; |
445 | |
446 | if (increment) { |
447 | if (tmp.sigl >= 0xfffff800) { |
448 | /* the sigl part overflows */ |
449 | if (tmp.sigh == 0xffffffff) { |
450 | /* The sigh part overflows */ |
451 | tmp.sigh = 0x80000000; |
452 | exp++; |
453 | if (exp >= EXP_OVER) |
454 | goto overflow; |
455 | } else { |
456 | tmp.sigh++; |
457 | } |
458 | tmp.sigl = 0x00000000; |
459 | } else { |
460 | /* We only need to increment sigl */ |
461 | tmp.sigl += 0x00000800; |
462 | } |
463 | } |
464 | } else |
465 | precision_loss = 0; |
466 | |
467 | l[0] = (tmp.sigl >> 11) | (tmp.sigh << 21); |
468 | l[1] = ((tmp.sigh >> 11) & 0xfffff); |
469 | |
470 | if (exp > DOUBLE_Emax) { |
471 | overflow: |
472 | EXCEPTION(EX_Overflow); |
473 | if (!(control_word & CW_Overflow)) |
474 | return 0; |
475 | set_precision_flag_up(); |
476 | if (!(control_word & CW_Precision)) |
477 | return 0; |
478 | |
479 | /* This is a special case: see sec 16.2.5.1 of the 80486 book */ |
480 | /* Overflow to infinity */ |
481 | l[1] = 0x7ff00000; /* Set to + INF */ |
482 | } else { |
483 | if (precision_loss) { |
484 | if (increment) |
485 | set_precision_flag_up(); |
486 | else |
487 | set_precision_flag_down(); |
488 | } |
489 | /* Add the exponent */ |
490 | l[1] |= (((exp + DOUBLE_Ebias) & 0x7ff) << 20); |
491 | } |
492 | } |
493 | } else if (st0_tag == TAG_Zero) { |
494 | /* Number is zero */ |
495 | } else if (st0_tag == TAG_Special) { |
496 | st0_tag = FPU_Special(ptr: st0_ptr); |
497 | if (st0_tag == TW_Denormal) { |
498 | /* A denormal will always underflow. */ |
499 | #ifndef PECULIAR_486 |
500 | /* An 80486 is supposed to be able to generate |
501 | a denormal exception here, but... */ |
502 | /* Underflow has priority. */ |
503 | if (control_word & CW_Underflow) |
504 | denormal_operand(); |
505 | #endif /* PECULIAR_486 */ |
506 | reg_copy(x: st0_ptr, y: &tmp); |
507 | goto denormal_arg; |
508 | } else if (st0_tag == TW_Infinity) { |
509 | l[1] = 0x7ff00000; |
510 | } else if (st0_tag == TW_NaN) { |
511 | /* Is it really a NaN ? */ |
512 | if ((exponent(st0_ptr) == EXP_OVER) |
513 | && (st0_ptr->sigh & 0x80000000)) { |
514 | /* See if we can get a valid NaN from the FPU_REG */ |
515 | l[0] = |
516 | (st0_ptr->sigl >> 11) | (st0_ptr-> |
517 | sigh << 21); |
518 | l[1] = ((st0_ptr->sigh >> 11) & 0xfffff); |
519 | if (!(st0_ptr->sigh & 0x40000000)) { |
520 | /* It is a signalling NaN */ |
521 | EXCEPTION(EX_Invalid); |
522 | if (!(control_word & CW_Invalid)) |
523 | return 0; |
524 | l[1] |= (0x40000000 >> 11); |
525 | } |
526 | l[1] |= 0x7ff00000; |
527 | } else { |
528 | /* It is an unsupported data type */ |
529 | EXCEPTION(EX_Invalid); |
530 | if (!(control_word & CW_Invalid)) |
531 | return 0; |
532 | l[1] = 0xfff80000; |
533 | } |
534 | } |
535 | } else if (st0_tag == TAG_Empty) { |
536 | /* Empty register (stack underflow) */ |
537 | EXCEPTION(EX_StackUnder); |
538 | if (control_word & CW_Invalid) { |
539 | /* The masked response */ |
540 | /* Put out the QNaN indefinite */ |
541 | RE_ENTRANT_CHECK_OFF; |
542 | FPU_access_ok(dfloat, 8); |
543 | FPU_put_user(0, (unsigned long __user *)dfloat); |
544 | FPU_put_user(0xfff80000, |
545 | 1 + (unsigned long __user *)dfloat); |
546 | RE_ENTRANT_CHECK_ON; |
547 | return 1; |
548 | } else |
549 | return 0; |
550 | } |
551 | if (getsign(st0_ptr)) |
552 | l[1] |= 0x80000000; |
553 | |
554 | RE_ENTRANT_CHECK_OFF; |
555 | FPU_access_ok(dfloat, 8); |
556 | FPU_put_user(l[0], (unsigned long __user *)dfloat); |
557 | FPU_put_user(l[1], 1 + (unsigned long __user *)dfloat); |
558 | RE_ENTRANT_CHECK_ON; |
559 | |
560 | return 1; |
561 | } |
562 | |
563 | /* Put a float into user memory */ |
564 | int FPU_store_single(FPU_REG *st0_ptr, u_char st0_tag, float __user *single) |
565 | { |
566 | long templ = 0; |
567 | unsigned long increment = 0; /* avoid gcc warnings */ |
568 | int precision_loss; |
569 | int exp; |
570 | FPU_REG tmp; |
571 | |
572 | if (st0_tag == TAG_Valid) { |
573 | |
574 | reg_copy(x: st0_ptr, y: &tmp); |
575 | exp = exponent(&tmp); |
576 | |
577 | if (exp < SINGLE_Emin) { |
578 | addexponent(&tmp, -SINGLE_Emin + 23); /* largest exp to be 22 */ |
579 | |
580 | denormal_arg: |
581 | |
582 | if ((precision_loss = FPU_round_to_int(r: &tmp, tag: st0_tag))) { |
583 | #ifdef PECULIAR_486 |
584 | /* Did it round to a non-denormal ? */ |
585 | /* This behaviour might be regarded as peculiar, it appears |
586 | that the 80486 rounds to the dest precision, then |
587 | converts to decide underflow. */ |
588 | if (!((tmp.sigl == 0x00800000) && |
589 | ((st0_ptr->sigh & 0x000000ff) |
590 | || st0_ptr->sigl))) |
591 | #endif /* PECULIAR_486 */ |
592 | { |
593 | EXCEPTION(EX_Underflow); |
594 | /* This is a special case: see sec 16.2.5.1 of |
595 | the 80486 book */ |
596 | if (!(control_word & CW_Underflow)) |
597 | return 0; |
598 | } |
599 | EXCEPTION(precision_loss); |
600 | if (!(control_word & CW_Precision)) |
601 | return 0; |
602 | } |
603 | templ = tmp.sigl; |
604 | } else { |
605 | if (tmp.sigl | (tmp.sigh & 0x000000ff)) { |
606 | unsigned long sigh = tmp.sigh; |
607 | unsigned long sigl = tmp.sigl; |
608 | |
609 | precision_loss = 1; |
610 | switch (control_word & CW_RC) { |
611 | case RC_RND: |
612 | increment = ((sigh & 0xff) > 0x80) /* more than half */ |
613 | ||(((sigh & 0xff) == 0x80) && sigl) /* more than half */ |
614 | ||((sigh & 0x180) == 0x180); /* round to even */ |
615 | break; |
616 | case RC_DOWN: /* towards -infinity */ |
617 | increment = signpositive(&tmp) |
618 | ? 0 : (sigl | (sigh & 0xff)); |
619 | break; |
620 | case RC_UP: /* towards +infinity */ |
621 | increment = signpositive(&tmp) |
622 | ? (sigl | (sigh & 0xff)) : 0; |
623 | break; |
624 | case RC_CHOP: |
625 | increment = 0; |
626 | break; |
627 | } |
628 | |
629 | /* Truncate part of the mantissa */ |
630 | tmp.sigl = 0; |
631 | |
632 | if (increment) { |
633 | if (sigh >= 0xffffff00) { |
634 | /* The sigh part overflows */ |
635 | tmp.sigh = 0x80000000; |
636 | exp++; |
637 | if (exp >= EXP_OVER) |
638 | goto overflow; |
639 | } else { |
640 | tmp.sigh &= 0xffffff00; |
641 | tmp.sigh += 0x100; |
642 | } |
643 | } else { |
644 | tmp.sigh &= 0xffffff00; /* Finish the truncation */ |
645 | } |
646 | } else |
647 | precision_loss = 0; |
648 | |
649 | templ = (tmp.sigh >> 8) & 0x007fffff; |
650 | |
651 | if (exp > SINGLE_Emax) { |
652 | overflow: |
653 | EXCEPTION(EX_Overflow); |
654 | if (!(control_word & CW_Overflow)) |
655 | return 0; |
656 | set_precision_flag_up(); |
657 | if (!(control_word & CW_Precision)) |
658 | return 0; |
659 | |
660 | /* This is a special case: see sec 16.2.5.1 of the 80486 book. */ |
661 | /* Masked response is overflow to infinity. */ |
662 | templ = 0x7f800000; |
663 | } else { |
664 | if (precision_loss) { |
665 | if (increment) |
666 | set_precision_flag_up(); |
667 | else |
668 | set_precision_flag_down(); |
669 | } |
670 | /* Add the exponent */ |
671 | templ |= ((exp + SINGLE_Ebias) & 0xff) << 23; |
672 | } |
673 | } |
674 | } else if (st0_tag == TAG_Zero) { |
675 | templ = 0; |
676 | } else if (st0_tag == TAG_Special) { |
677 | st0_tag = FPU_Special(ptr: st0_ptr); |
678 | if (st0_tag == TW_Denormal) { |
679 | reg_copy(x: st0_ptr, y: &tmp); |
680 | |
681 | /* A denormal will always underflow. */ |
682 | #ifndef PECULIAR_486 |
683 | /* An 80486 is supposed to be able to generate |
684 | a denormal exception here, but... */ |
685 | /* Underflow has priority. */ |
686 | if (control_word & CW_Underflow) |
687 | denormal_operand(); |
688 | #endif /* PECULIAR_486 */ |
689 | goto denormal_arg; |
690 | } else if (st0_tag == TW_Infinity) { |
691 | templ = 0x7f800000; |
692 | } else if (st0_tag == TW_NaN) { |
693 | /* Is it really a NaN ? */ |
694 | if ((exponent(st0_ptr) == EXP_OVER) |
695 | && (st0_ptr->sigh & 0x80000000)) { |
696 | /* See if we can get a valid NaN from the FPU_REG */ |
697 | templ = st0_ptr->sigh >> 8; |
698 | if (!(st0_ptr->sigh & 0x40000000)) { |
699 | /* It is a signalling NaN */ |
700 | EXCEPTION(EX_Invalid); |
701 | if (!(control_word & CW_Invalid)) |
702 | return 0; |
703 | templ |= (0x40000000 >> 8); |
704 | } |
705 | templ |= 0x7f800000; |
706 | } else { |
707 | /* It is an unsupported data type */ |
708 | EXCEPTION(EX_Invalid); |
709 | if (!(control_word & CW_Invalid)) |
710 | return 0; |
711 | templ = 0xffc00000; |
712 | } |
713 | } |
714 | #ifdef PARANOID |
715 | else { |
716 | EXCEPTION(EX_INTERNAL | 0x164); |
717 | return 0; |
718 | } |
719 | #endif |
720 | } else if (st0_tag == TAG_Empty) { |
721 | /* Empty register (stack underflow) */ |
722 | EXCEPTION(EX_StackUnder); |
723 | if (control_word & EX_Invalid) { |
724 | /* The masked response */ |
725 | /* Put out the QNaN indefinite */ |
726 | RE_ENTRANT_CHECK_OFF; |
727 | FPU_access_ok(single, 4); |
728 | FPU_put_user(0xffc00000, |
729 | (unsigned long __user *)single); |
730 | RE_ENTRANT_CHECK_ON; |
731 | return 1; |
732 | } else |
733 | return 0; |
734 | } |
735 | #ifdef PARANOID |
736 | else { |
737 | EXCEPTION(EX_INTERNAL | 0x163); |
738 | return 0; |
739 | } |
740 | #endif |
741 | if (getsign(st0_ptr)) |
742 | templ |= 0x80000000; |
743 | |
744 | RE_ENTRANT_CHECK_OFF; |
745 | FPU_access_ok(single, 4); |
746 | FPU_put_user(templ, (unsigned long __user *)single); |
747 | RE_ENTRANT_CHECK_ON; |
748 | |
749 | return 1; |
750 | } |
751 | |
752 | /* Put a long long into user memory */ |
753 | int FPU_store_int64(FPU_REG *st0_ptr, u_char st0_tag, long long __user *d) |
754 | { |
755 | FPU_REG t; |
756 | long long tll; |
757 | int precision_loss; |
758 | |
759 | if (st0_tag == TAG_Empty) { |
760 | /* Empty register (stack underflow) */ |
761 | EXCEPTION(EX_StackUnder); |
762 | goto invalid_operand; |
763 | } else if (st0_tag == TAG_Special) { |
764 | st0_tag = FPU_Special(ptr: st0_ptr); |
765 | if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) { |
766 | EXCEPTION(EX_Invalid); |
767 | goto invalid_operand; |
768 | } |
769 | } |
770 | |
771 | reg_copy(x: st0_ptr, y: &t); |
772 | precision_loss = FPU_round_to_int(r: &t, tag: st0_tag); |
773 | ((long *)&tll)[0] = t.sigl; |
774 | ((long *)&tll)[1] = t.sigh; |
775 | if ((precision_loss == 1) || |
776 | ((t.sigh & 0x80000000) && |
777 | !((t.sigh == 0x80000000) && (t.sigl == 0) && signnegative(&t)))) { |
778 | EXCEPTION(EX_Invalid); |
779 | /* This is a special case: see sec 16.2.5.1 of the 80486 book */ |
780 | invalid_operand: |
781 | if (control_word & EX_Invalid) { |
782 | /* Produce something like QNaN "indefinite" */ |
783 | tll = 0x8000000000000000LL; |
784 | } else |
785 | return 0; |
786 | } else { |
787 | if (precision_loss) |
788 | set_precision_flag(precision_loss); |
789 | if (signnegative(&t)) |
790 | tll = -tll; |
791 | } |
792 | |
793 | RE_ENTRANT_CHECK_OFF; |
794 | FPU_access_ok(d, 8); |
795 | if (copy_to_user(to: d, from: &tll, n: 8)) |
796 | FPU_abort; |
797 | RE_ENTRANT_CHECK_ON; |
798 | |
799 | return 1; |
800 | } |
801 | |
802 | /* Put a long into user memory */ |
803 | int FPU_store_int32(FPU_REG *st0_ptr, u_char st0_tag, long __user *d) |
804 | { |
805 | FPU_REG t; |
806 | int precision_loss; |
807 | |
808 | if (st0_tag == TAG_Empty) { |
809 | /* Empty register (stack underflow) */ |
810 | EXCEPTION(EX_StackUnder); |
811 | goto invalid_operand; |
812 | } else if (st0_tag == TAG_Special) { |
813 | st0_tag = FPU_Special(ptr: st0_ptr); |
814 | if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) { |
815 | EXCEPTION(EX_Invalid); |
816 | goto invalid_operand; |
817 | } |
818 | } |
819 | |
820 | reg_copy(x: st0_ptr, y: &t); |
821 | precision_loss = FPU_round_to_int(r: &t, tag: st0_tag); |
822 | if (t.sigh || |
823 | ((t.sigl & 0x80000000) && |
824 | !((t.sigl == 0x80000000) && signnegative(&t)))) { |
825 | EXCEPTION(EX_Invalid); |
826 | /* This is a special case: see sec 16.2.5.1 of the 80486 book */ |
827 | invalid_operand: |
828 | if (control_word & EX_Invalid) { |
829 | /* Produce something like QNaN "indefinite" */ |
830 | t.sigl = 0x80000000; |
831 | } else |
832 | return 0; |
833 | } else { |
834 | if (precision_loss) |
835 | set_precision_flag(precision_loss); |
836 | if (signnegative(&t)) |
837 | t.sigl = -(long)t.sigl; |
838 | } |
839 | |
840 | RE_ENTRANT_CHECK_OFF; |
841 | FPU_access_ok(d, 4); |
842 | FPU_put_user(t.sigl, (unsigned long __user *)d); |
843 | RE_ENTRANT_CHECK_ON; |
844 | |
845 | return 1; |
846 | } |
847 | |
848 | /* Put a short into user memory */ |
849 | int FPU_store_int16(FPU_REG *st0_ptr, u_char st0_tag, short __user *d) |
850 | { |
851 | FPU_REG t; |
852 | int precision_loss; |
853 | |
854 | if (st0_tag == TAG_Empty) { |
855 | /* Empty register (stack underflow) */ |
856 | EXCEPTION(EX_StackUnder); |
857 | goto invalid_operand; |
858 | } else if (st0_tag == TAG_Special) { |
859 | st0_tag = FPU_Special(ptr: st0_ptr); |
860 | if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) { |
861 | EXCEPTION(EX_Invalid); |
862 | goto invalid_operand; |
863 | } |
864 | } |
865 | |
866 | reg_copy(x: st0_ptr, y: &t); |
867 | precision_loss = FPU_round_to_int(r: &t, tag: st0_tag); |
868 | if (t.sigh || |
869 | ((t.sigl & 0xffff8000) && |
870 | !((t.sigl == 0x8000) && signnegative(&t)))) { |
871 | EXCEPTION(EX_Invalid); |
872 | /* This is a special case: see sec 16.2.5.1 of the 80486 book */ |
873 | invalid_operand: |
874 | if (control_word & EX_Invalid) { |
875 | /* Produce something like QNaN "indefinite" */ |
876 | t.sigl = 0x8000; |
877 | } else |
878 | return 0; |
879 | } else { |
880 | if (precision_loss) |
881 | set_precision_flag(precision_loss); |
882 | if (signnegative(&t)) |
883 | t.sigl = -t.sigl; |
884 | } |
885 | |
886 | RE_ENTRANT_CHECK_OFF; |
887 | FPU_access_ok(d, 2); |
888 | FPU_put_user((short)t.sigl, d); |
889 | RE_ENTRANT_CHECK_ON; |
890 | |
891 | return 1; |
892 | } |
893 | |
894 | /* Put a packed bcd array into user memory */ |
895 | int FPU_store_bcd(FPU_REG *st0_ptr, u_char st0_tag, u_char __user *d) |
896 | { |
897 | FPU_REG t; |
898 | unsigned long long ll; |
899 | u_char b; |
900 | int i, precision_loss; |
901 | u_char sign = (getsign(st0_ptr) == SIGN_NEG) ? 0x80 : 0; |
902 | |
903 | if (st0_tag == TAG_Empty) { |
904 | /* Empty register (stack underflow) */ |
905 | EXCEPTION(EX_StackUnder); |
906 | goto invalid_operand; |
907 | } else if (st0_tag == TAG_Special) { |
908 | st0_tag = FPU_Special(ptr: st0_ptr); |
909 | if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) { |
910 | EXCEPTION(EX_Invalid); |
911 | goto invalid_operand; |
912 | } |
913 | } |
914 | |
915 | reg_copy(x: st0_ptr, y: &t); |
916 | precision_loss = FPU_round_to_int(r: &t, tag: st0_tag); |
917 | ll = significand(&t); |
918 | |
919 | /* Check for overflow, by comparing with 999999999999999999 decimal. */ |
920 | if ((t.sigh > 0x0de0b6b3) || |
921 | ((t.sigh == 0x0de0b6b3) && (t.sigl > 0xa763ffff))) { |
922 | EXCEPTION(EX_Invalid); |
923 | /* This is a special case: see sec 16.2.5.1 of the 80486 book */ |
924 | invalid_operand: |
925 | if (control_word & CW_Invalid) { |
926 | /* Produce the QNaN "indefinite" */ |
927 | RE_ENTRANT_CHECK_OFF; |
928 | FPU_access_ok(d, 10); |
929 | for (i = 0; i < 7; i++) |
930 | FPU_put_user(0, d + i); /* These bytes "undefined" */ |
931 | FPU_put_user(0xc0, d + 7); /* This byte "undefined" */ |
932 | FPU_put_user(0xff, d + 8); |
933 | FPU_put_user(0xff, d + 9); |
934 | RE_ENTRANT_CHECK_ON; |
935 | return 1; |
936 | } else |
937 | return 0; |
938 | } else if (precision_loss) { |
939 | /* Precision loss doesn't stop the data transfer */ |
940 | set_precision_flag(precision_loss); |
941 | } |
942 | |
943 | RE_ENTRANT_CHECK_OFF; |
944 | FPU_access_ok(d, 10); |
945 | RE_ENTRANT_CHECK_ON; |
946 | for (i = 0; i < 9; i++) { |
947 | b = FPU_div_small(x: &ll, y: 10); |
948 | b |= (FPU_div_small(x: &ll, y: 10)) << 4; |
949 | RE_ENTRANT_CHECK_OFF; |
950 | FPU_put_user(b, d + i); |
951 | RE_ENTRANT_CHECK_ON; |
952 | } |
953 | RE_ENTRANT_CHECK_OFF; |
954 | FPU_put_user(sign, d + 9); |
955 | RE_ENTRANT_CHECK_ON; |
956 | |
957 | return 1; |
958 | } |
959 | |
960 | /*===========================================================================*/ |
961 | |
962 | /* r gets mangled such that sig is int, sign: |
963 | it is NOT normalized */ |
964 | /* The return value (in eax) is zero if the result is exact, |
965 | if bits are changed due to rounding, truncation, etc, then |
966 | a non-zero value is returned */ |
967 | /* Overflow is signaled by a non-zero return value (in eax). |
968 | In the case of overflow, the returned significand always has the |
969 | largest possible value */ |
970 | int FPU_round_to_int(FPU_REG *r, u_char tag) |
971 | { |
972 | u_char very_big; |
973 | unsigned eax; |
974 | |
975 | if (tag == TAG_Zero) { |
976 | /* Make sure that zero is returned */ |
977 | significand(r) = 0; |
978 | return 0; /* o.k. */ |
979 | } |
980 | |
981 | if (exponent(r) > 63) { |
982 | r->sigl = r->sigh = ~0; /* The largest representable number */ |
983 | return 1; /* overflow */ |
984 | } |
985 | |
986 | eax = FPU_shrxs(v: &r->sigl, x: 63 - exponent(r)); |
987 | very_big = !(~(r->sigh) | ~(r->sigl)); /* test for 0xfff...fff */ |
988 | #define half_or_more (eax & 0x80000000) |
989 | #define frac_part (eax) |
990 | #define more_than_half ((eax & 0x80000001) == 0x80000001) |
991 | switch (control_word & CW_RC) { |
992 | case RC_RND: |
993 | if (more_than_half /* nearest */ |
994 | || (half_or_more && (r->sigl & 1))) { /* odd -> even */ |
995 | if (very_big) |
996 | return 1; /* overflow */ |
997 | significand(r)++; |
998 | return PRECISION_LOST_UP; |
999 | } |
1000 | break; |
1001 | case RC_DOWN: |
1002 | if (frac_part && getsign(r)) { |
1003 | if (very_big) |
1004 | return 1; /* overflow */ |
1005 | significand(r)++; |
1006 | return PRECISION_LOST_UP; |
1007 | } |
1008 | break; |
1009 | case RC_UP: |
1010 | if (frac_part && !getsign(r)) { |
1011 | if (very_big) |
1012 | return 1; /* overflow */ |
1013 | significand(r)++; |
1014 | return PRECISION_LOST_UP; |
1015 | } |
1016 | break; |
1017 | case RC_CHOP: |
1018 | break; |
1019 | } |
1020 | |
1021 | return eax ? PRECISION_LOST_DOWN : 0; |
1022 | |
1023 | } |
1024 | |
1025 | /*===========================================================================*/ |
1026 | |
1027 | u_char __user *fldenv(fpu_addr_modes addr_modes, u_char __user *s) |
1028 | { |
1029 | unsigned short tag_word = 0; |
1030 | u_char tag; |
1031 | int i; |
1032 | |
1033 | if ((addr_modes.default_mode == VM86) || |
1034 | ((addr_modes.default_mode == PM16) |
1035 | ^ (addr_modes.override.operand_size == OP_SIZE_PREFIX))) { |
1036 | RE_ENTRANT_CHECK_OFF; |
1037 | FPU_access_ok(s, 0x0e); |
1038 | FPU_get_user(control_word, (unsigned short __user *)s); |
1039 | FPU_get_user(partial_status, (unsigned short __user *)(s + 2)); |
1040 | FPU_get_user(tag_word, (unsigned short __user *)(s + 4)); |
1041 | FPU_get_user(instruction_address.offset, |
1042 | (unsigned short __user *)(s + 6)); |
1043 | FPU_get_user(instruction_address.selector, |
1044 | (unsigned short __user *)(s + 8)); |
1045 | FPU_get_user(operand_address.offset, |
1046 | (unsigned short __user *)(s + 0x0a)); |
1047 | FPU_get_user(operand_address.selector, |
1048 | (unsigned short __user *)(s + 0x0c)); |
1049 | RE_ENTRANT_CHECK_ON; |
1050 | s += 0x0e; |
1051 | if (addr_modes.default_mode == VM86) { |
1052 | instruction_address.offset |
1053 | += (instruction_address.selector & 0xf000) << 4; |
1054 | operand_address.offset += |
1055 | (operand_address.selector & 0xf000) << 4; |
1056 | } |
1057 | } else { |
1058 | RE_ENTRANT_CHECK_OFF; |
1059 | FPU_access_ok(s, 0x1c); |
1060 | FPU_get_user(control_word, (unsigned short __user *)s); |
1061 | FPU_get_user(partial_status, (unsigned short __user *)(s + 4)); |
1062 | FPU_get_user(tag_word, (unsigned short __user *)(s + 8)); |
1063 | FPU_get_user(instruction_address.offset, |
1064 | (unsigned long __user *)(s + 0x0c)); |
1065 | FPU_get_user(instruction_address.selector, |
1066 | (unsigned short __user *)(s + 0x10)); |
1067 | FPU_get_user(instruction_address.opcode, |
1068 | (unsigned short __user *)(s + 0x12)); |
1069 | FPU_get_user(operand_address.offset, |
1070 | (unsigned long __user *)(s + 0x14)); |
1071 | FPU_get_user(operand_address.selector, |
1072 | (unsigned long __user *)(s + 0x18)); |
1073 | RE_ENTRANT_CHECK_ON; |
1074 | s += 0x1c; |
1075 | } |
1076 | |
1077 | #ifdef PECULIAR_486 |
1078 | control_word &= ~0xe080; |
1079 | #endif /* PECULIAR_486 */ |
1080 | |
1081 | top = (partial_status >> SW_Top_Shift) & 7; |
1082 | |
1083 | if (partial_status & ~control_word & CW_Exceptions) |
1084 | partial_status |= (SW_Summary | SW_Backward); |
1085 | else |
1086 | partial_status &= ~(SW_Summary | SW_Backward); |
1087 | |
1088 | for (i = 0; i < 8; i++) { |
1089 | tag = tag_word & 3; |
1090 | tag_word >>= 2; |
1091 | |
1092 | if (tag == TAG_Empty) |
1093 | /* New tag is empty. Accept it */ |
1094 | FPU_settag(regnr: i, TAG_Empty); |
1095 | else if (FPU_gettag(regnr: i) == TAG_Empty) { |
1096 | /* Old tag is empty and new tag is not empty. New tag is determined |
1097 | by old reg contents */ |
1098 | if (exponent(&fpu_register(i)) == -EXTENDED_Ebias) { |
1099 | if (! |
1100 | (fpu_register(i).sigl | fpu_register(i). |
1101 | sigh)) |
1102 | FPU_settag(regnr: i, TAG_Zero); |
1103 | else |
1104 | FPU_settag(regnr: i, TAG_Special); |
1105 | } else if (exponent(&fpu_register(i)) == |
1106 | 0x7fff - EXTENDED_Ebias) { |
1107 | FPU_settag(regnr: i, TAG_Special); |
1108 | } else if (fpu_register(i).sigh & 0x80000000) |
1109 | FPU_settag(regnr: i, TAG_Valid); |
1110 | else |
1111 | FPU_settag(regnr: i, TAG_Special); /* An Un-normal */ |
1112 | } |
1113 | /* Else old tag is not empty and new tag is not empty. Old tag |
1114 | remains correct */ |
1115 | } |
1116 | |
1117 | return s; |
1118 | } |
1119 | |
1120 | void FPU_frstor(fpu_addr_modes addr_modes, u_char __user *data_address) |
1121 | { |
1122 | int i, regnr; |
1123 | u_char __user *s = fldenv(addr_modes, s: data_address); |
1124 | int offset = (top & 7) * 10, other = 80 - offset; |
1125 | |
1126 | /* Copy all registers in stack order. */ |
1127 | RE_ENTRANT_CHECK_OFF; |
1128 | FPU_access_ok(s, 80); |
1129 | FPU_copy_from_user(register_base + offset, s, other); |
1130 | if (offset) |
1131 | FPU_copy_from_user(register_base, s + other, offset); |
1132 | RE_ENTRANT_CHECK_ON; |
1133 | |
1134 | for (i = 0; i < 8; i++) { |
1135 | regnr = (i + top) & 7; |
1136 | if (FPU_gettag(regnr) != TAG_Empty) |
1137 | /* The loaded data over-rides all other cases. */ |
1138 | FPU_settag(regnr, tag: FPU_tagof(ptr: &st(i))); |
1139 | } |
1140 | |
1141 | } |
1142 | |
1143 | u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d) |
1144 | { |
1145 | if ((addr_modes.default_mode == VM86) || |
1146 | ((addr_modes.default_mode == PM16) |
1147 | ^ (addr_modes.override.operand_size == OP_SIZE_PREFIX))) { |
1148 | RE_ENTRANT_CHECK_OFF; |
1149 | FPU_access_ok(d, 14); |
1150 | #ifdef PECULIAR_486 |
1151 | FPU_put_user(control_word & ~0xe080, (unsigned long __user *)d); |
1152 | #else |
1153 | FPU_put_user(control_word, (unsigned short __user *)d); |
1154 | #endif /* PECULIAR_486 */ |
1155 | FPU_put_user(status_word(), (unsigned short __user *)(d + 2)); |
1156 | FPU_put_user(fpu_tag_word, (unsigned short __user *)(d + 4)); |
1157 | FPU_put_user(instruction_address.offset, |
1158 | (unsigned short __user *)(d + 6)); |
1159 | FPU_put_user(operand_address.offset, |
1160 | (unsigned short __user *)(d + 0x0a)); |
1161 | if (addr_modes.default_mode == VM86) { |
1162 | FPU_put_user((instruction_address. |
1163 | offset & 0xf0000) >> 4, |
1164 | (unsigned short __user *)(d + 8)); |
1165 | FPU_put_user((operand_address.offset & 0xf0000) >> 4, |
1166 | (unsigned short __user *)(d + 0x0c)); |
1167 | } else { |
1168 | FPU_put_user(instruction_address.selector, |
1169 | (unsigned short __user *)(d + 8)); |
1170 | FPU_put_user(operand_address.selector, |
1171 | (unsigned short __user *)(d + 0x0c)); |
1172 | } |
1173 | RE_ENTRANT_CHECK_ON; |
1174 | d += 0x0e; |
1175 | } else { |
1176 | RE_ENTRANT_CHECK_OFF; |
1177 | FPU_access_ok(d, 7 * 4); |
1178 | #ifdef PECULIAR_486 |
1179 | control_word &= ~0xe080; |
1180 | /* An 80486 sets nearly all of the reserved bits to 1. */ |
1181 | control_word |= 0xffff0040; |
1182 | partial_status = status_word() | 0xffff0000; |
1183 | fpu_tag_word |= 0xffff0000; |
1184 | I387->soft.fcs &= ~0xf8000000; |
1185 | I387->soft.fos |= 0xffff0000; |
1186 | #endif /* PECULIAR_486 */ |
1187 | if (__copy_to_user(to: d, from: &control_word, n: 7 * 4)) |
1188 | FPU_abort; |
1189 | RE_ENTRANT_CHECK_ON; |
1190 | d += 0x1c; |
1191 | } |
1192 | |
1193 | control_word |= CW_Exceptions; |
1194 | partial_status &= ~(SW_Summary | SW_Backward); |
1195 | |
1196 | return d; |
1197 | } |
1198 | |
1199 | void fsave(fpu_addr_modes addr_modes, u_char __user *data_address) |
1200 | { |
1201 | u_char __user *d; |
1202 | int offset = (top & 7) * 10, other = 80 - offset; |
1203 | |
1204 | d = fstenv(addr_modes, d: data_address); |
1205 | |
1206 | RE_ENTRANT_CHECK_OFF; |
1207 | FPU_access_ok(d, 80); |
1208 | |
1209 | /* Copy all registers in stack order. */ |
1210 | if (__copy_to_user(to: d, register_base + offset, n: other)) |
1211 | FPU_abort; |
1212 | if (offset) |
1213 | if (__copy_to_user(to: d + other, register_base, n: offset)) |
1214 | FPU_abort; |
1215 | RE_ENTRANT_CHECK_ON; |
1216 | |
1217 | finit(); |
1218 | } |
1219 | |
1220 | /*===========================================================================*/ |
1221 | |