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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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 | ||
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
1da177e4 LT |
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 | ||
3d0d14f9 | 31 | #define DOUBLE_Emax 1023 /* largest valid exponent */ |
1da177e4 | 32 | #define DOUBLE_Ebias 1023 |
3d0d14f9 | 33 | #define DOUBLE_Emin (-1022) /* smallest valid exponent */ |
1da177e4 | 34 | |
3d0d14f9 | 35 | #define SINGLE_Emax 127 /* largest valid exponent */ |
1da177e4 | 36 | #define SINGLE_Ebias 127 |
3d0d14f9 | 37 | #define SINGLE_Emin (-126) /* smallest valid exponent */ |
1da177e4 | 38 | |
e8d591dc | 39 | static u_char normalize_no_excep(FPU_REG *r, int exp, int sign) |
1da177e4 | 40 | { |
3d0d14f9 | 41 | u_char tag; |
1da177e4 | 42 | |
3d0d14f9 | 43 | setexponent16(r, exp); |
1da177e4 | 44 | |
3d0d14f9 IM |
45 | tag = FPU_normalize_nuo(r); |
46 | stdexp(r); | |
47 | if (sign) | |
48 | setnegative(r); | |
1da177e4 | 49 | |
3d0d14f9 | 50 | return tag; |
1da177e4 LT |
51 | } |
52 | ||
e8d591dc | 53 | int FPU_tagof(FPU_REG *ptr) |
1da177e4 | 54 | { |
3d0d14f9 IM |
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; | |
1da177e4 | 69 | } |
1da177e4 | 70 | |
3d0d14f9 IM |
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 | } | |
1da177e4 LT |
80 | |
81 | /* Get a long double from user memory */ | |
e8d591dc | 82 | int FPU_load_extended(long double __user *s, int stnr) |
1da177e4 | 83 | { |
3d0d14f9 | 84 | FPU_REG *sti_ptr = &st(stnr); |
1da177e4 | 85 | |
3d0d14f9 IM |
86 | RE_ENTRANT_CHECK_OFF; |
87 | FPU_access_ok(VERIFY_READ, s, 10); | |
88 | __copy_from_user(sti_ptr, s, 10); | |
89 | RE_ENTRANT_CHECK_ON; | |
1da177e4 | 90 | |
3d0d14f9 | 91 | return FPU_tagof(sti_ptr); |
1da177e4 LT |
92 | } |
93 | ||
1da177e4 | 94 | /* Get a double from user memory */ |
e8d591dc | 95 | int FPU_load_double(double __user *dfloat, FPU_REG *loaded_data) |
1da177e4 | 96 | { |
3d0d14f9 IM |
97 | int exp, tag, negative; |
98 | unsigned m64, l64; | |
99 | ||
100 | RE_ENTRANT_CHECK_OFF; | |
101 | FPU_access_ok(VERIFY_READ, 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(&CONST_Z, 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(loaded_data, DOUBLE_Emin, | |
139 | 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; | |
1da177e4 | 146 | |
3d0d14f9 IM |
147 | tag = TAG_Valid; |
148 | } | |
1da177e4 | 149 | |
3d0d14f9 | 150 | setexponent16(loaded_data, exp | negative); |
1da177e4 | 151 | |
3d0d14f9 | 152 | return tag; |
1da177e4 LT |
153 | } |
154 | ||
1da177e4 | 155 | /* Get a float from user memory */ |
e8d591dc | 156 | int FPU_load_single(float __user *single, FPU_REG *loaded_data) |
1da177e4 | 157 | { |
3d0d14f9 IM |
158 | unsigned m32; |
159 | int exp, tag, negative; | |
160 | ||
161 | RE_ENTRANT_CHECK_OFF; | |
162 | FPU_access_ok(VERIFY_READ, 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(&CONST_Z, loaded_data); | |
171 | addexponent(loaded_data, negative); | |
172 | return TAG_Zero; | |
1da177e4 | 173 | } |
3d0d14f9 IM |
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(loaded_data, SINGLE_Emin, 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; | |
1da177e4 | 202 | } |
1da177e4 | 203 | |
3d0d14f9 | 204 | setexponent16(loaded_data, exp | negative); /* Set the sign. */ |
1da177e4 | 205 | |
3d0d14f9 | 206 | return tag; |
1da177e4 LT |
207 | } |
208 | ||
1da177e4 | 209 | /* Get a long long from user memory */ |
e8d591dc | 210 | int FPU_load_int64(long long __user *_s) |
1da177e4 | 211 | { |
3d0d14f9 IM |
212 | long long s; |
213 | int sign; | |
214 | FPU_REG *st0_ptr = &st(0); | |
215 | ||
216 | RE_ENTRANT_CHECK_OFF; | |
217 | FPU_access_ok(VERIFY_READ, _s, 8); | |
218 | if (copy_from_user(&s, _s, 8)) | |
219 | FPU_abort; | |
220 | RE_ENTRANT_CHECK_ON; | |
221 | ||
222 | if (s == 0) { | |
223 | reg_copy(&CONST_Z, 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 | } | |
1da177e4 | 233 | |
3d0d14f9 IM |
234 | significand(st0_ptr) = s; |
235 | ||
236 | return normalize_no_excep(st0_ptr, 63, sign); | |
237 | } | |
1da177e4 LT |
238 | |
239 | /* Get a long from user memory */ | |
e8d591dc | 240 | int FPU_load_int32(long __user *_s, FPU_REG *loaded_data) |
1da177e4 | 241 | { |
3d0d14f9 IM |
242 | long s; |
243 | int negative; | |
1da177e4 | 244 | |
3d0d14f9 IM |
245 | RE_ENTRANT_CHECK_OFF; |
246 | FPU_access_ok(VERIFY_READ, _s, 4); | |
247 | FPU_get_user(s, _s); | |
248 | RE_ENTRANT_CHECK_ON; | |
1da177e4 | 249 | |
3d0d14f9 IM |
250 | if (s == 0) { |
251 | reg_copy(&CONST_Z, loaded_data); | |
252 | return TAG_Zero; | |
253 | } | |
1da177e4 | 254 | |
3d0d14f9 IM |
255 | if (s > 0) |
256 | negative = SIGN_Positive; | |
257 | else { | |
258 | s = -s; | |
259 | negative = SIGN_Negative; | |
260 | } | |
1da177e4 | 261 | |
3d0d14f9 IM |
262 | loaded_data->sigh = s; |
263 | loaded_data->sigl = 0; | |
1da177e4 | 264 | |
3d0d14f9 | 265 | return normalize_no_excep(loaded_data, 31, negative); |
1da177e4 LT |
266 | } |
267 | ||
1da177e4 | 268 | /* Get a short from user memory */ |
e8d591dc | 269 | int FPU_load_int16(short __user *_s, FPU_REG *loaded_data) |
1da177e4 | 270 | { |
3d0d14f9 | 271 | int s, negative; |
1da177e4 | 272 | |
3d0d14f9 IM |
273 | RE_ENTRANT_CHECK_OFF; |
274 | FPU_access_ok(VERIFY_READ, _s, 2); | |
275 | /* Cast as short to get the sign extended. */ | |
276 | FPU_get_user(s, _s); | |
277 | RE_ENTRANT_CHECK_ON; | |
1da177e4 | 278 | |
3d0d14f9 IM |
279 | if (s == 0) { |
280 | reg_copy(&CONST_Z, loaded_data); | |
281 | return TAG_Zero; | |
282 | } | |
1da177e4 | 283 | |
3d0d14f9 IM |
284 | if (s > 0) |
285 | negative = SIGN_Positive; | |
286 | else { | |
287 | s = -s; | |
288 | negative = SIGN_Negative; | |
289 | } | |
1da177e4 | 290 | |
3d0d14f9 IM |
291 | loaded_data->sigh = s << 16; |
292 | loaded_data->sigl = 0; | |
1da177e4 | 293 | |
3d0d14f9 | 294 | return normalize_no_excep(loaded_data, 15, negative); |
1da177e4 LT |
295 | } |
296 | ||
1da177e4 | 297 | /* Get a packed bcd array from user memory */ |
e8d591dc | 298 | int FPU_load_bcd(u_char __user *s) |
1da177e4 | 299 | { |
3d0d14f9 IM |
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(VERIFY_READ, 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(&CONST_Z, 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(st0_ptr, 63, sign); | |
331 | } | |
1da177e4 LT |
332 | } |
333 | ||
334 | /*===========================================================================*/ | |
335 | ||
336 | /* Put a long double into user memory */ | |
e8d591dc | 337 | int FPU_store_extended(FPU_REG *st0_ptr, u_char st0_tag, |
3d0d14f9 | 338 | long double __user * d) |
1da177e4 | 339 | { |
3d0d14f9 IM |
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(VERIFY_WRITE, 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 | } | |
1da177e4 | 360 | |
3d0d14f9 IM |
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(VERIFY_WRITE, 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; | |
1da177e4 | 375 | |
3d0d14f9 | 376 | } |
1da177e4 LT |
377 | |
378 | /* Put a double into user memory */ | |
e8d591dc | 379 | int FPU_store_double(FPU_REG *st0_ptr, u_char st0_tag, double __user *dfloat) |
1da177e4 | 380 | { |
3d0d14f9 IM |
381 | unsigned long l[2]; |
382 | unsigned long increment = 0; /* avoid gcc warnings */ | |
383 | int precision_loss; | |
384 | int exp; | |
385 | FPU_REG tmp; | |
1da177e4 | 386 | |
f2e576b8 AM |
387 | l[0] = 0; |
388 | l[1] = 0; | |
3d0d14f9 IM |
389 | if (st0_tag == TAG_Valid) { |
390 | reg_copy(st0_ptr, &tmp); | |
391 | exp = exponent(&tmp); | |
1da177e4 | 392 | |
3d0d14f9 IM |
393 | if (exp < DOUBLE_Emin) { /* It may be a denormal */ |
394 | addexponent(&tmp, -DOUBLE_Emin + 52); /* largest exp to be 51 */ | |
f2e576b8 | 395 | denormal_arg: |
3d0d14f9 | 396 | if ((precision_loss = FPU_round_to_int(&tmp, st0_tag))) { |
1da177e4 | 397 | #ifdef PECULIAR_486 |
3d0d14f9 IM |
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))) | |
1da177e4 | 405 | #endif /* PECULIAR_486 */ |
3d0d14f9 IM |
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; | |
1da177e4 | 416 | } |
3d0d14f9 IM |
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 */ | |
f2e576b8 | 481 | l[1] = 0x7ff00000; /* Set to + INF */ |
3d0d14f9 IM |
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); | |
1da177e4 | 491 | } |
1da177e4 | 492 | } |
3d0d14f9 IM |
493 | } else if (st0_tag == TAG_Zero) { |
494 | /* Number is zero */ | |
3d0d14f9 IM |
495 | } else if (st0_tag == TAG_Special) { |
496 | st0_tag = FPU_Special(st0_ptr); | |
497 | if (st0_tag == TW_Denormal) { | |
498 | /* A denormal will always underflow. */ | |
1da177e4 | 499 | #ifndef PECULIAR_486 |
3d0d14f9 IM |
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(); | |
1da177e4 | 505 | #endif /* PECULIAR_486 */ |
3d0d14f9 IM |
506 | reg_copy(st0_ptr, &tmp); |
507 | goto denormal_arg; | |
508 | } else if (st0_tag == TW_Infinity) { | |
3d0d14f9 IM |
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; | |
3d0d14f9 IM |
532 | l[1] = 0xfff80000; |
533 | } | |
1da177e4 | 534 | } |
3d0d14f9 IM |
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(VERIFY_WRITE, 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; | |
1da177e4 | 550 | } |
3d0d14f9 IM |
551 | if (getsign(st0_ptr)) |
552 | l[1] |= 0x80000000; | |
1da177e4 | 553 | |
3d0d14f9 IM |
554 | RE_ENTRANT_CHECK_OFF; |
555 | FPU_access_ok(VERIFY_WRITE, 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 | } | |
1da177e4 LT |
562 | |
563 | /* Put a float into user memory */ | |
e8d591dc | 564 | int FPU_store_single(FPU_REG *st0_ptr, u_char st0_tag, float __user *single) |
1da177e4 | 565 | { |
3d0d14f9 IM |
566 | long templ = 0; |
567 | unsigned long increment = 0; /* avoid gcc warnings */ | |
568 | int precision_loss; | |
569 | int exp; | |
570 | FPU_REG tmp; | |
1da177e4 | 571 | |
3d0d14f9 | 572 | if (st0_tag == TAG_Valid) { |
1da177e4 | 573 | |
3d0d14f9 IM |
574 | reg_copy(st0_ptr, &tmp); |
575 | exp = exponent(&tmp); | |
1da177e4 | 576 | |
3d0d14f9 IM |
577 | if (exp < SINGLE_Emin) { |
578 | addexponent(&tmp, -SINGLE_Emin + 23); /* largest exp to be 22 */ | |
1da177e4 | 579 | |
3d0d14f9 | 580 | denormal_arg: |
1da177e4 | 581 | |
3d0d14f9 | 582 | if ((precision_loss = FPU_round_to_int(&tmp, st0_tag))) { |
1da177e4 | 583 | #ifdef PECULIAR_486 |
3d0d14f9 IM |
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))) | |
1da177e4 | 591 | #endif /* PECULIAR_486 */ |
3d0d14f9 IM |
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 | } | |
1da177e4 | 673 | } |
3d0d14f9 IM |
674 | } else if (st0_tag == TAG_Zero) { |
675 | templ = 0; | |
676 | } else if (st0_tag == TAG_Special) { | |
677 | st0_tag = FPU_Special(st0_ptr); | |
678 | if (st0_tag == TW_Denormal) { | |
679 | reg_copy(st0_ptr, &tmp); | |
680 | ||
681 | /* A denormal will always underflow. */ | |
1da177e4 | 682 | #ifndef PECULIAR_486 |
3d0d14f9 IM |
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 | } | |
1da177e4 | 713 | } |
1da177e4 | 714 | #ifdef PARANOID |
3d0d14f9 IM |
715 | else { |
716 | EXCEPTION(EX_INTERNAL | 0x164); | |
717 | return 0; | |
718 | } | |
1da177e4 | 719 | #endif |
3d0d14f9 IM |
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(VERIFY_WRITE, 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; | |
1da177e4 | 734 | } |
1da177e4 | 735 | #ifdef PARANOID |
3d0d14f9 IM |
736 | else { |
737 | EXCEPTION(EX_INTERNAL | 0x163); | |
738 | return 0; | |
739 | } | |
1da177e4 | 740 | #endif |
3d0d14f9 IM |
741 | if (getsign(st0_ptr)) |
742 | templ |= 0x80000000; | |
1da177e4 | 743 | |
3d0d14f9 IM |
744 | RE_ENTRANT_CHECK_OFF; |
745 | FPU_access_ok(VERIFY_WRITE, single, 4); | |
746 | FPU_put_user(templ, (unsigned long __user *)single); | |
747 | RE_ENTRANT_CHECK_ON; | |
1da177e4 | 748 | |
3d0d14f9 | 749 | return 1; |
1da177e4 LT |
750 | } |
751 | ||
1da177e4 | 752 | /* Put a long long into user memory */ |
e8d591dc | 753 | int FPU_store_int64(FPU_REG *st0_ptr, u_char st0_tag, long long __user *d) |
1da177e4 | 754 | { |
3d0d14f9 IM |
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(st0_ptr); | |
765 | if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) { | |
766 | EXCEPTION(EX_Invalid); | |
767 | goto invalid_operand; | |
768 | } | |
1da177e4 | 769 | } |
3d0d14f9 IM |
770 | |
771 | reg_copy(st0_ptr, &t); | |
772 | precision_loss = FPU_round_to_int(&t, 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; | |
1da177e4 | 791 | } |
1da177e4 | 792 | |
3d0d14f9 IM |
793 | RE_ENTRANT_CHECK_OFF; |
794 | FPU_access_ok(VERIFY_WRITE, d, 8); | |
795 | if (copy_to_user(d, &tll, 8)) | |
796 | FPU_abort; | |
797 | RE_ENTRANT_CHECK_ON; | |
798 | ||
799 | return 1; | |
800 | } | |
1da177e4 LT |
801 | |
802 | /* Put a long into user memory */ | |
e8d591dc | 803 | int FPU_store_int32(FPU_REG *st0_ptr, u_char st0_tag, long __user *d) |
1da177e4 | 804 | { |
3d0d14f9 IM |
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(st0_ptr); | |
814 | if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) { | |
815 | EXCEPTION(EX_Invalid); | |
816 | goto invalid_operand; | |
817 | } | |
1da177e4 | 818 | } |
3d0d14f9 IM |
819 | |
820 | reg_copy(st0_ptr, &t); | |
821 | precision_loss = FPU_round_to_int(&t, 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; | |
1da177e4 | 838 | } |
1da177e4 | 839 | |
3d0d14f9 IM |
840 | RE_ENTRANT_CHECK_OFF; |
841 | FPU_access_ok(VERIFY_WRITE, d, 4); | |
842 | FPU_put_user(t.sigl, (unsigned long __user *)d); | |
843 | RE_ENTRANT_CHECK_ON; | |
844 | ||
845 | return 1; | |
846 | } | |
1da177e4 LT |
847 | |
848 | /* Put a short into user memory */ | |
e8d591dc | 849 | int FPU_store_int16(FPU_REG *st0_ptr, u_char st0_tag, short __user *d) |
1da177e4 | 850 | { |
3d0d14f9 IM |
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(st0_ptr); | |
860 | if ((st0_tag == TW_Infinity) || (st0_tag == TW_NaN)) { | |
861 | EXCEPTION(EX_Invalid); | |
862 | goto invalid_operand; | |
863 | } | |
1da177e4 | 864 | } |
3d0d14f9 IM |
865 | |
866 | reg_copy(st0_ptr, &t); | |
867 | precision_loss = FPU_round_to_int(&t, 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; | |
1da177e4 | 884 | } |
1da177e4 | 885 | |
3d0d14f9 IM |
886 | RE_ENTRANT_CHECK_OFF; |
887 | FPU_access_ok(VERIFY_WRITE, d, 2); | |
888 | FPU_put_user((short)t.sigl, d); | |
889 | RE_ENTRANT_CHECK_ON; | |
890 | ||
891 | return 1; | |
892 | } | |
1da177e4 LT |
893 | |
894 | /* Put a packed bcd array into user memory */ | |
e8d591dc | 895 | int FPU_store_bcd(FPU_REG *st0_ptr, u_char st0_tag, u_char __user *d) |
1da177e4 | 896 | { |
3d0d14f9 IM |
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(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(st0_ptr, &t); | |
916 | precision_loss = FPU_round_to_int(&t, 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(VERIFY_WRITE, 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); | |
1da177e4 | 941 | } |
3d0d14f9 IM |
942 | |
943 | RE_ENTRANT_CHECK_OFF; | |
944 | FPU_access_ok(VERIFY_WRITE, d, 10); | |
945 | RE_ENTRANT_CHECK_ON; | |
946 | for (i = 0; i < 9; i++) { | |
947 | b = FPU_div_small(&ll, 10); | |
948 | b |= (FPU_div_small(&ll, 10)) << 4; | |
949 | RE_ENTRANT_CHECK_OFF; | |
950 | FPU_put_user(b, d + i); | |
951 | RE_ENTRANT_CHECK_ON; | |
1da177e4 | 952 | } |
3d0d14f9 IM |
953 | RE_ENTRANT_CHECK_OFF; |
954 | FPU_put_user(sign, d + 9); | |
955 | RE_ENTRANT_CHECK_ON; | |
956 | ||
957 | return 1; | |
1da177e4 LT |
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 signalled by a non-zero return value (in eax). | |
968 | In the case of overflow, the returned significand always has the | |
969 | largest possible value */ | |
e8d591dc | 970 | int FPU_round_to_int(FPU_REG *r, u_char tag) |
1da177e4 | 971 | { |
3d0d14f9 IM |
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(&r->sigl, 63 - exponent(r)); | |
987 | very_big = !(~(r->sigh) | ~(r->sigl)); /* test for 0xfff...fff */ | |
1da177e4 LT |
988 | #define half_or_more (eax & 0x80000000) |
989 | #define frac_part (eax) | |
990 | #define more_than_half ((eax & 0x80000001) == 0x80000001) | |
3d0d14f9 IM |
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; | |
1da177e4 | 1019 | } |
1da177e4 | 1020 | |
3d0d14f9 | 1021 | return eax ? PRECISION_LOST_DOWN : 0; |
1da177e4 LT |
1022 | |
1023 | } | |
1024 | ||
1025 | /*===========================================================================*/ | |
1026 | ||
e8d591dc | 1027 | u_char __user *fldenv(fpu_addr_modes addr_modes, u_char __user *s) |
1da177e4 | 1028 | { |
3d0d14f9 IM |
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(VERIFY_READ, 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(VERIFY_READ, 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; | |
1da177e4 | 1075 | } |
1da177e4 LT |
1076 | |
1077 | #ifdef PECULIAR_486 | |
3d0d14f9 IM |
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(i, TAG_Empty); | |
1095 | else if (FPU_gettag(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(i, TAG_Zero); | |
1103 | else | |
1104 | FPU_settag(i, TAG_Special); | |
1105 | } else if (exponent(&fpu_register(i)) == | |
1106 | 0x7fff - EXTENDED_Ebias) { | |
1107 | FPU_settag(i, TAG_Special); | |
1108 | } else if (fpu_register(i).sigh & 0x80000000) | |
1109 | FPU_settag(i, TAG_Valid); | |
1110 | else | |
1111 | FPU_settag(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 | } | |
1da177e4 | 1116 | |
3d0d14f9 IM |
1117 | return s; |
1118 | } | |
1da177e4 | 1119 | |
e8d591dc | 1120 | void frstor(fpu_addr_modes addr_modes, u_char __user *data_address) |
1da177e4 | 1121 | { |
3d0d14f9 IM |
1122 | int i, regnr; |
1123 | u_char __user *s = fldenv(addr_modes, 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(VERIFY_READ, s, 80); | |
1129 | __copy_from_user(register_base + offset, s, other); | |
1130 | if (offset) | |
1131 | __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, FPU_tagof(&st(i))); | |
1139 | } | |
1da177e4 LT |
1140 | |
1141 | } | |
1142 | ||
e8d591dc | 1143 | u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d) |
1da177e4 | 1144 | { |
3d0d14f9 IM |
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(VERIFY_WRITE, d, 14); | |
1da177e4 | 1150 | #ifdef PECULIAR_486 |
3d0d14f9 | 1151 | FPU_put_user(control_word & ~0xe080, (unsigned long __user *)d); |
1da177e4 | 1152 | #else |
3d0d14f9 | 1153 | FPU_put_user(control_word, (unsigned short __user *)d); |
1da177e4 | 1154 | #endif /* PECULIAR_486 */ |
3d0d14f9 IM |
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(VERIFY_WRITE, d, 7 * 4); | |
1da177e4 | 1178 | #ifdef PECULIAR_486 |
3d0d14f9 IM |
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; | |
61c4628b SS |
1184 | I387->soft.fcs &= ~0xf8000000; |
1185 | I387->soft.fos |= 0xffff0000; | |
1da177e4 | 1186 | #endif /* PECULIAR_486 */ |
3d0d14f9 IM |
1187 | if (__copy_to_user(d, &control_word, 7 * 4)) |
1188 | FPU_abort; | |
1189 | RE_ENTRANT_CHECK_ON; | |
1190 | d += 0x1c; | |
1191 | } | |
1da177e4 | 1192 | |
3d0d14f9 IM |
1193 | control_word |= CW_Exceptions; |
1194 | partial_status &= ~(SW_Summary | SW_Backward); | |
1195 | ||
1196 | return d; | |
1197 | } | |
1da177e4 | 1198 | |
e8d591dc | 1199 | void fsave(fpu_addr_modes addr_modes, u_char __user *data_address) |
1da177e4 | 1200 | { |
3d0d14f9 IM |
1201 | u_char __user *d; |
1202 | int offset = (top & 7) * 10, other = 80 - offset; | |
1da177e4 | 1203 | |
3d0d14f9 | 1204 | d = fstenv(addr_modes, data_address); |
1da177e4 | 1205 | |
3d0d14f9 IM |
1206 | RE_ENTRANT_CHECK_OFF; |
1207 | FPU_access_ok(VERIFY_WRITE, d, 80); | |
1da177e4 | 1208 | |
3d0d14f9 IM |
1209 | /* Copy all registers in stack order. */ |
1210 | if (__copy_to_user(d, register_base + offset, other)) | |
1211 | FPU_abort; | |
1212 | if (offset) | |
1213 | if (__copy_to_user(d + other, register_base, offset)) | |
1214 | FPU_abort; | |
1215 | RE_ENTRANT_CHECK_ON; | |
1da177e4 | 1216 | |
3d0d14f9 | 1217 | finit(); |
1da177e4 LT |
1218 | } |
1219 | ||
1220 | /*===========================================================================*/ |