1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
24 */
25 /*
26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
28 */
29
30 #include "fenv_synonyms.h"
31 #undef lint
32 #include <signal.h>
33 #include <siginfo.h>
34 #include <ucontext.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 #include <thread.h>
39 #include <math.h>
40 #if defined(__SUNPRO_C)
41 #include <sunmath.h>
42 #endif
43 #include <fenv.h>
44 #include "fex_handler.h"
45 #include "fenv_inlines.h"
46
47 #if defined(__sparc) && !defined(__sparcv9)
48 #include <sys/procfs.h>
49 #endif
50
51 /* 2.x signal.h doesn't declare sigemptyset or sigismember
52 if they're #defined (see sys/signal.h) */
53 extern int sigemptyset(sigset_t *);
54 extern int sigismember(const sigset_t *, int);
55
56 /* external globals */
57 void (*__mt_fex_sync)() = NULL; /* for synchronization with libmtsk */
58 #pragma weak __mt_fex_sync
59
60 #ifdef LIBM_MT_FEX_SYNC
61 void (*__libm_mt_fex_sync)() = NULL; /* new, improved version of above */
62 #pragma weak __libm_mt_fex_sync
63 #endif
64
65 /* private variables */
66 static fex_handler_t main_handlers;
67 static int handlers_initialized = 0;
68 static thread_key_t handlers_key;
69 static mutex_t handlers_key_lock = DEFAULTMUTEX;
70
71 static struct sigaction oact = { 0, SIG_DFL };
72 static mutex_t hdlr_lock = DEFAULTMUTEX;
73 static int hdlr_installed = 0;
74
75 /* private const data */
76 static const int te_bit[FEX_NUM_EXC] = {
77 1 << fp_trap_inexact,
78 1 << fp_trap_division,
79 1 << fp_trap_underflow,
80 1 << fp_trap_overflow,
81 1 << fp_trap_invalid,
82 1 << fp_trap_invalid,
83 1 << fp_trap_invalid,
84 1 << fp_trap_invalid,
85 1 << fp_trap_invalid,
86 1 << fp_trap_invalid,
87 1 << fp_trap_invalid,
88 1 << fp_trap_invalid
89 };
90
91 /*
92 * Return the traps to be enabled given the current handling modes
93 * and flags
94 */
95 static int
96 __fex_te_needed(struct fex_handler_data *thr_handlers, unsigned long fsr)
97 {
98 int i, ex, te;
99
100 /* set traps for handling modes */
101 te = 0;
102 for (i = 0; i < FEX_NUM_EXC; i++)
103 if (thr_handlers[i].__mode != FEX_NONSTOP)
104 te |= te_bit[i];
105
106 /* add traps for retrospective diagnostics */
107 if (fex_get_log()) {
108 ex = (int)__fenv_get_ex(fsr);
109 if (!(ex & FE_INEXACT))
110 te |= (1 << fp_trap_inexact);
111 if (!(ex & FE_UNDERFLOW))
112 te |= (1 << fp_trap_underflow);
113 if (!(ex & FE_OVERFLOW))
114 te |= (1 << fp_trap_overflow);
115 if (!(ex & FE_DIVBYZERO))
116 te |= (1 << fp_trap_division);
117 if (!(ex & FE_INVALID))
118 te |= (1 << fp_trap_invalid);
119 }
120
121 return te;
122 }
123
124 /*
125 * The following function synchronizes with libmtsk (SPARC only, for now)
126 */
127 static void
128 __fex_sync_with_libmtsk(int begin, int master)
129 {
130 static fenv_t master_env;
131 static int env_initialized = 0;
132 static mutex_t env_lock = DEFAULTMUTEX;
133
134 if (begin) {
135 mutex_lock(&env_lock);
136 if (master) {
137 (void) fegetenv(&master_env);
138 env_initialized = 1;
139 }
140 else if (env_initialized)
141 (void) fesetenv(&master_env);
142 mutex_unlock(&env_lock);
143 }
144 else if (master && fex_get_log())
145 __fex_update_te();
146 }
147
148 #ifdef LIBM_MT_FEX_SYNC
149 /*
150 * The following function may be used for synchronization with any
151 * internal project that manages multiple threads
152 */
153 enum __libm_mt_fex_sync_actions {
154 __libm_mt_fex_start_master = 0,
155 __libm_mt_fex_start_slave,
156 __libm_mt_fex_finish_master,
157 __libm_mt_fex_finish_slave
158 };
159
160 struct __libm_mt_fex_sync_data {
161 fenv_t master_env;
162 int initialized;
163 mutex_t lock;
164 };
165
166 static void
167 __fex_sync_with_threads(enum __libm_mt_fex_sync_actions action,
168 struct __libm_mt_fex_sync_data *thr_env)
169 {
170 switch (action) {
171 case __libm_mt_fex_start_master:
172 mutex_lock(&thr_env->lock);
173 (void) fegetenv(&thr_env->master_env);
174 thr_env->initialized = 1;
175 mutex_unlock(&thr_env->lock);
176 break;
177
178 case __libm_mt_fex_start_slave:
179 mutex_lock(&thr_env->lock);
180 if (thr_env->initialized)
181 (void) fesetenv(&thr_env->master_env);
182 mutex_unlock(&thr_env->lock);
183 break;
184
185 case __libm_mt_fex_finish_master:
186 #if defined(__x86)
187 __fex_update_te();
188 #else
189 if (fex_get_log())
190 __fex_update_te();
191 #endif
192 break;
193
194 case __libm_mt_fex_finish_slave:
195 #if defined(__x86)
196 /* clear traps, making all accrued flags visible in status word */
197 {
198 unsigned long fsr;
199 __fenv_getfsr(&fsr);
200 __fenv_set_te(fsr, 0);
201 __fenv_setfsr(&fsr);
202 }
203 #endif
204 break;
205 }
206 }
207 #endif
208
209 #if defined(__sparc)
210
211 /*
212 * Code for setting or clearing interval mode on US-III and above.
213 * This is embedded as data so we don't have to mark the library
214 * as a v8plusb/v9b object. (I could have just used one entry and
215 * modified the second word to set the bits I want, but that would
216 * have required another mutex.)
217 */
218 static const unsigned int siam[][2] = {
219 { 0x81c3e008, 0x81b01020 }, /* retl, siam 0 */
220 { 0x81c3e008, 0x81b01024 }, /* retl, siam 4 */
221 { 0x81c3e008, 0x81b01025 }, /* retl, siam 5 */
222 { 0x81c3e008, 0x81b01026 }, /* retl, siam 6 */
223 { 0x81c3e008, 0x81b01027 } /* retl, siam 7 */
224 };
225
226 /*
227 * If a handling mode is in effect, apply it; otherwise invoke the
228 * saved handler
229 */
230 static void
231 __fex_hdlr(int sig, siginfo_t *sip, ucontext_t *uap)
232 {
233 struct fex_handler_data *thr_handlers;
234 struct sigaction act;
235 void (*handler)(), (*siamp)();
236 int mode, i;
237 enum fex_exception e;
238 fex_info_t info;
239 unsigned long fsr, tmpfsr, addr;
240 unsigned int gsr;
241
242 /* determine which exception occurred */
243 switch (sip->si_code) {
244 case FPE_FLTDIV:
245 e = fex_division;
246 break;
247 case FPE_FLTOVF:
248 e = fex_overflow;
249 break;
250 case FPE_FLTUND:
251 e = fex_underflow;
252 break;
253 case FPE_FLTRES:
254 e = fex_inexact;
255 break;
256 case FPE_FLTINV:
257 if ((int)(e = __fex_get_invalid_type(sip, uap)) < 0)
258 goto not_ieee;
259 break;
260 default:
261 /* not an IEEE exception */
262 goto not_ieee;
263 }
264
265 /* get the handling mode */
266 mode = FEX_NOHANDLER;
267 handler = oact.sa_handler; /* for log; just looking, no need to lock */
268 thr_handlers = __fex_get_thr_handlers();
269 if (thr_handlers && thr_handlers[(int)e].__mode != FEX_NOHANDLER) {
270 mode = thr_handlers[(int)e].__mode;
271 handler = thr_handlers[(int)e].__handler;
272 }
273
274 /* make an entry in the log of retro. diag. if need be */
275 i = ((int)uap->uc_mcontext.fpregs.fpu_fsr >> 5) & 0x1f;
276 __fex_mklog(uap, (char *)sip->si_addr, i, e, mode, (void *)handler);
277
278 /* handle the exception based on the mode */
279 if (mode == FEX_NOHANDLER)
280 goto not_ieee;
281 else if (mode == FEX_ABORT)
282 abort();
283 else if (mode == FEX_SIGNAL) {
284 handler(sig, sip, uap);
285 return;
286 }
287
288 /* custom or nonstop mode; disable traps and clear flags */
289 __fenv_getfsr(&fsr);
290 __fenv_set_te(fsr, 0);
291 __fenv_set_ex(fsr, 0);
292
293 /* if interval mode was set, clear it, then substitute the
294 interval rounding direction and clear ns mode in the fsr */
295 #ifdef __sparcv9
296 gsr = uap->uc_mcontext.asrs[3];
297 #else
298 gsr = 0;
299 if (uap->uc_mcontext.xrs.xrs_id == XRS_ID)
300 gsr = (*(unsigned long long*)((prxregset_t*)uap->uc_mcontext.
301 xrs.xrs_ptr)->pr_un.pr_v8p.pr_filler);
302 #endif
303 gsr = (gsr >> 25) & 7;
304 if (gsr & 4) {
305 siamp = (void (*)()) siam[0];
306 siamp();
307 tmpfsr = fsr;
308 fsr = (fsr & ~0xc0400000ul) | ((gsr & 3) << 30);
309 }
310 __fenv_setfsr(&fsr);
311
312 /* decode the operation */
313 __fex_get_op(sip, uap, &info);
314
315 /* if a custom mode handler is installed, invoke it */
316 if (mode == FEX_CUSTOM) {
317 /* if we got here from feraiseexcept, pass dummy info */
318 addr = (unsigned long)sip->si_addr;
319 if (addr >= (unsigned long)feraiseexcept &&
320 addr < (unsigned long)fetestexcept) {
321 info.op = fex_other;
322 info.op1.type = info.op2.type = info.res.type =
323 fex_nodata;
324 }
325
326 /* restore interval mode if it was set, and put the original
327 rounding direction and ns mode back in the fsr */
328 if (gsr & 4) {
329 __fenv_setfsr(&tmpfsr);
330 siamp = (void (*)()) siam[1 + (gsr & 3)];
331 siamp();
332 }
333
334 handler(1 << (int)e, &info);
335
336 /* restore modes in case the user's handler changed them */
337 if (gsr & 4) {
338 siamp = (void (*)()) siam[0];
339 siamp();
340 }
341 __fenv_setfsr(&fsr);
342 }
343
344 /* stuff the result */
345 __fex_st_result(sip, uap, &info);
346
347 /* "or" in any exception flags and update traps */
348 fsr = uap->uc_mcontext.fpregs.fpu_fsr;
349 fsr |= ((info.flags & 0x1f) << 5);
350 i = __fex_te_needed(thr_handlers, fsr);
351 __fenv_set_te(fsr, i);
352 uap->uc_mcontext.fpregs.fpu_fsr = fsr;
353 return;
354
355 not_ieee:
356 /* revert to the saved handler (if any) */
357 mutex_lock(&hdlr_lock);
358 act = oact;
359 mutex_unlock(&hdlr_lock);
360 switch ((unsigned long)act.sa_handler) {
361 case (unsigned long)SIG_DFL:
362 /* simulate trap with no handler installed */
363 sigaction(SIGFPE, &act, NULL);
364 kill(getpid(), SIGFPE);
365 break;
366 #if !defined(__lint)
367 case (unsigned long)SIG_IGN:
368 break;
369 #endif
370 default:
371 act.sa_handler(sig, sip, uap);
372 }
373 }
374
375 #elif defined(__x86)
376
377 #if defined(__amd64)
378 #define test_sse_hw 1
379 #else
380 extern int _sse_hw;
381 #define test_sse_hw _sse_hw
382 #endif
383
384 #if !defined(REG_PC)
385 #define REG_PC EIP
386 #endif
387
388 /*
389 * If a handling mode is in effect, apply it; otherwise invoke the
390 * saved handler
391 */
392 static void
393 __fex_hdlr(int sig, siginfo_t *sip, ucontext_t *uap)
394 {
395 struct fex_handler_data *thr_handlers;
396 struct sigaction act;
397 void (*handler)() = NULL, (*simd_handler[4])();
398 int mode, simd_mode[4], i, len, accrued, *ap;
399 unsigned int cwsw, oldcwsw, mxcsr, oldmxcsr;
400 enum fex_exception e, simd_e[4];
401 fex_info_t info, simd_info[4];
402 unsigned long addr;
403 siginfo_t osip = *sip;
404 sseinst_t inst;
405
406 /* check for an exception caused by an SSE instruction */
407 if (!(uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.status & 0x80)) {
408 len = __fex_parse_sse(uap, &inst);
409 if (len == 0)
410 goto not_ieee;
411
412 /* disable all traps and clear flags */
413 __fenv_getcwsw(&oldcwsw);
414 cwsw = (oldcwsw & ~0x3f) | 0x003f0000;
415 __fenv_setcwsw(&cwsw);
416 __fenv_getmxcsr(&oldmxcsr);
417 mxcsr = (oldmxcsr & ~0x3f) | 0x1f80;
418 __fenv_setmxcsr(&mxcsr);
419
420 if ((int)inst.op & SIMD) {
421 __fex_get_simd_op(uap, &inst, simd_e, simd_info);
422
423 thr_handlers = __fex_get_thr_handlers();
424 addr = (unsigned long)uap->uc_mcontext.gregs[REG_PC];
425 accrued = uap->uc_mcontext.fpregs.fp_reg_set.
426 fpchip_state.mxcsr;
427
428 e = (enum fex_exception)-1;
429 mode = FEX_NONSTOP;
430 for (i = 0; i < 4; i++) {
431 if ((int)simd_e[i] < 0)
432 continue;
433
434 e = simd_e[i];
435 simd_mode[i] = FEX_NOHANDLER;
436 simd_handler[i] = oact.sa_handler;
437 if (thr_handlers &&
438 thr_handlers[(int)e].__mode !=
439 FEX_NOHANDLER) {
440 simd_mode[i] =
441 thr_handlers[(int)e].__mode;
442 simd_handler[i] =
443 thr_handlers[(int)e].__handler;
444 }
445 accrued &= ~te_bit[(int)e];
446 switch (simd_mode[i]) {
447 case FEX_ABORT:
448 mode = FEX_ABORT;
449 break;
450 case FEX_SIGNAL:
451 if (mode != FEX_ABORT)
452 mode = FEX_SIGNAL;
453 handler = simd_handler[i];
454 break;
455 case FEX_NOHANDLER:
456 if (mode != FEX_ABORT && mode !=
457 FEX_SIGNAL)
458 mode = FEX_NOHANDLER;
459 break;
460 }
461 }
462 if (e == (enum fex_exception)-1) {
463 __fenv_setcwsw(&oldcwsw);
464 __fenv_setmxcsr(&oldmxcsr);
465 goto not_ieee;
466 }
467 accrued |= uap->uc_mcontext.fpregs.fp_reg_set.
468 fpchip_state.status;
469 ap = __fex_accrued();
470 accrued |= *ap;
471 accrued &= 0x3d;
472
473 for (i = 0; i < 4; i++) {
474 if ((int)simd_e[i] < 0)
475 continue;
476
477 __fex_mklog(uap, (char *)addr, accrued,
478 simd_e[i], simd_mode[i],
479 (void *)simd_handler[i]);
480 }
481
482 if (mode == FEX_NOHANDLER) {
483 __fenv_setcwsw(&oldcwsw);
484 __fenv_setmxcsr(&oldmxcsr);
485 goto not_ieee;
486 } else if (mode == FEX_ABORT) {
487 abort();
488 } else if (mode == FEX_SIGNAL) {
489 __fenv_setcwsw(&oldcwsw);
490 __fenv_setmxcsr(&oldmxcsr);
491 handler(sig, &osip, uap);
492 return;
493 }
494
495 *ap = 0;
496 for (i = 0; i < 4; i++) {
497 if ((int)simd_e[i] < 0)
498 continue;
499
500 if (simd_mode[i] == FEX_CUSTOM) {
501 handler(1 << (int)simd_e[i],
502 &simd_info[i]);
503 __fenv_setcwsw(&cwsw);
504 __fenv_setmxcsr(&mxcsr);
505 }
506 }
507
508 __fex_st_simd_result(uap, &inst, simd_e, simd_info);
509 for (i = 0; i < 4; i++) {
510 if ((int)simd_e[i] < 0)
511 continue;
512
513 accrued |= simd_info[i].flags;
514 }
515
516 if ((int)inst.op & INTREG) {
517 /* set MMX mode */
518 #if defined(__amd64)
519 uap->uc_mcontext.fpregs.fp_reg_set.
520 fpchip_state.sw &= ~0x3800;
521 uap->uc_mcontext.fpregs.fp_reg_set.
522 fpchip_state.fctw = 0;
523 #else
524 uap->uc_mcontext.fpregs.fp_reg_set.
525 fpchip_state.state[1] &= ~0x3800;
526 uap->uc_mcontext.fpregs.fp_reg_set.
527 fpchip_state.state[2] = 0;
528 #endif
529 }
530 } else {
531 e = __fex_get_sse_op(uap, &inst, &info);
532 if ((int)e < 0) {
533 __fenv_setcwsw(&oldcwsw);
534 __fenv_setmxcsr(&oldmxcsr);
535 goto not_ieee;
536 }
537
538 mode = FEX_NOHANDLER;
539 handler = oact.sa_handler;
540 thr_handlers = __fex_get_thr_handlers();
541 if (thr_handlers && thr_handlers[(int)e].__mode !=
542 FEX_NOHANDLER) {
543 mode = thr_handlers[(int)e].__mode;
544 handler = thr_handlers[(int)e].__handler;
545 }
546
547 addr = (unsigned long)uap->uc_mcontext.gregs[REG_PC];
548 accrued = uap->uc_mcontext.fpregs.fp_reg_set.
549 fpchip_state.mxcsr & ~te_bit[(int)e];
550 accrued |= uap->uc_mcontext.fpregs.fp_reg_set.
551 fpchip_state.status;
552 ap = __fex_accrued();
553 accrued |= *ap;
554 accrued &= 0x3d;
555 __fex_mklog(uap, (char *)addr, accrued, e, mode,
556 (void *)handler);
557
558 if (mode == FEX_NOHANDLER) {
559 __fenv_setcwsw(&oldcwsw);
560 __fenv_setmxcsr(&oldmxcsr);
561 goto not_ieee;
562 } else if (mode == FEX_ABORT) {
563 abort();
564 } else if (mode == FEX_SIGNAL) {
565 __fenv_setcwsw(&oldcwsw);
566 __fenv_setmxcsr(&oldmxcsr);
567 handler(sig, &osip, uap);
568 return;
569 } else if (mode == FEX_CUSTOM) {
570 *ap = 0;
571 if (addr >= (unsigned long)feraiseexcept &&
572 addr < (unsigned long)fetestexcept) {
573 info.op = fex_other;
574 info.op1.type = info.op2.type =
575 info.res.type = fex_nodata;
576 }
577 handler(1 << (int)e, &info);
578 __fenv_setcwsw(&cwsw);
579 __fenv_setmxcsr(&mxcsr);
580 }
581
582 __fex_st_sse_result(uap, &inst, e, &info);
583 accrued |= info.flags;
584
585 #if defined(__amd64)
586 /*
587 * In 64-bit mode, the 32-bit convert-to-integer
588 * instructions zero the upper 32 bits of the
589 * destination. (We do this here and not in
590 * __fex_st_sse_result because __fex_st_sse_result
591 * can be called from __fex_st_simd_result, too.)
592 */
593 if (inst.op == cvtss2si || inst.op == cvttss2si ||
594 inst.op == cvtsd2si || inst.op == cvttsd2si)
595 inst.op1->i[1] = 0;
596 #endif
597 }
598
599 /* advance the pc past the SSE instruction */
600 uap->uc_mcontext.gregs[REG_PC] += len;
601 goto update_state;
602 }
603
604 /* determine which exception occurred */
605 __fex_get_x86_exc(sip, uap);
606 switch (sip->si_code) {
607 case FPE_FLTDIV:
608 e = fex_division;
609 break;
610 case FPE_FLTOVF:
611 e = fex_overflow;
612 break;
613 case FPE_FLTUND:
614 e = fex_underflow;
615 break;
616 case FPE_FLTRES:
617 e = fex_inexact;
618 break;
619 case FPE_FLTINV:
620 if ((int)(e = __fex_get_invalid_type(sip, uap)) < 0)
621 goto not_ieee;
622 break;
623 default:
624 /* not an IEEE exception */
625 goto not_ieee;
626 }
627
628 /* get the handling mode */
629 mode = FEX_NOHANDLER;
630 handler = oact.sa_handler; /* for log; just looking, no need to lock */
631 thr_handlers = __fex_get_thr_handlers();
632 if (thr_handlers && thr_handlers[(int)e].__mode != FEX_NOHANDLER) {
633 mode = thr_handlers[(int)e].__mode;
634 handler = thr_handlers[(int)e].__handler;
635 }
636
637 /* make an entry in the log of retro. diag. if need be */
638 #if defined(__amd64)
639 addr = (unsigned long)uap->uc_mcontext.fpregs.fp_reg_set.
640 fpchip_state.rip;
641 #else
642 addr = (unsigned long)uap->uc_mcontext.fpregs.fp_reg_set.
643 fpchip_state.state[3];
644 #endif
645 accrued = uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.status &
646 ~te_bit[(int)e];
647 if (test_sse_hw)
648 accrued |= uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.
649 mxcsr;
650 ap = __fex_accrued();
651 accrued |= *ap;
652 accrued &= 0x3d;
653 __fex_mklog(uap, (char *)addr, accrued, e, mode, (void *)handler);
654
655 /* handle the exception based on the mode */
656 if (mode == FEX_NOHANDLER)
657 goto not_ieee;
658 else if (mode == FEX_ABORT)
659 abort();
660 else if (mode == FEX_SIGNAL) {
661 handler(sig, &osip, uap);
662 return;
663 }
664
665 /* disable all traps and clear flags */
666 __fenv_getcwsw(&cwsw);
667 cwsw = (cwsw & ~0x3f) | 0x003f0000;
668 __fenv_setcwsw(&cwsw);
669 if (test_sse_hw) {
670 __fenv_getmxcsr(&mxcsr);
671 mxcsr = (mxcsr & ~0x3f) | 0x1f80;
672 __fenv_setmxcsr(&mxcsr);
673 }
674 *ap = 0;
675
676 /* decode the operation */
677 __fex_get_op(sip, uap, &info);
678
679 /* if a custom mode handler is installed, invoke it */
680 if (mode == FEX_CUSTOM) {
681 /* if we got here from feraiseexcept, pass dummy info */
682 if (addr >= (unsigned long)feraiseexcept &&
683 addr < (unsigned long)fetestexcept) {
684 info.op = fex_other;
685 info.op1.type = info.op2.type = info.res.type =
686 fex_nodata;
687 }
688
689 handler(1 << (int)e, &info);
690
691 /* restore modes in case the user's handler changed them */
692 __fenv_setcwsw(&cwsw);
693 if (test_sse_hw)
694 __fenv_setmxcsr(&mxcsr);
695 }
696
697 /* stuff the result */
698 __fex_st_result(sip, uap, &info);
699 accrued |= info.flags;
700
701 update_state:
702 accrued &= 0x3d;
703 i = __fex_te_needed(thr_handlers, accrued);
704 *ap = accrued & i;
705 #if defined(__amd64)
706 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.sw &= ~0x3d;
707 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.sw |= (accrued & ~i);
708 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.cw |= 0x3d;
709 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.cw &= ~i;
710 #else
711 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[1] &= ~0x3d;
712 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[1] |=
713 (accrued & ~i);
714 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[0] |= 0x3d;
715 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[0] &= ~i;
716 #endif
717 if (test_sse_hw) {
718 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.mxcsr &= ~0x3d;
719 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.mxcsr |=
720 0x1e80 | (accrued & ~i);
721 uap->uc_mcontext.fpregs.fp_reg_set.fpchip_state.mxcsr &=
722 ~(i << 7);
723 }
724 return;
725
726 not_ieee:
727 /* revert to the saved handler (if any) */
728 mutex_lock(&hdlr_lock);
729 act = oact;
730 mutex_unlock(&hdlr_lock);
731 switch ((unsigned long)act.sa_handler) {
732 case (unsigned long)SIG_DFL:
733 /* simulate trap with no handler installed */
734 sigaction(SIGFPE, &act, NULL);
735 kill(getpid(), SIGFPE);
736 break;
737 #if !defined(__lint)
738 case (unsigned long)SIG_IGN:
739 break;
740 #endif
741 default:
742 act.sa_handler(sig, &osip, uap);
743 }
744 }
745
746 #else
747 #error Unknown architecture
748 #endif
749
750 /*
751 * Return a pointer to the thread-specific handler data, and
752 * initialize it if necessary
753 */
754 struct fex_handler_data *
755 __fex_get_thr_handlers()
756 {
757 struct fex_handler_data *ptr;
758 unsigned long fsr;
759 int i, te;
760
761 if (thr_main()) {
762 if (!handlers_initialized) {
763 /* initialize to FEX_NOHANDLER if trap is enabled,
764 FEX_NONSTOP if trap is disabled */
765 __fenv_getfsr(&fsr);
766 te = (int)__fenv_get_te(fsr);
767 for (i = 0; i < FEX_NUM_EXC; i++)
768 main_handlers[i].__mode =
769 ((te & te_bit[i])? FEX_NOHANDLER : FEX_NONSTOP);
770 handlers_initialized = 1;
771 }
772 return main_handlers;
773 }
774 else {
775 ptr = NULL;
776 mutex_lock(&handlers_key_lock);
777 if (thr_getspecific(handlers_key, (void **)&ptr) != 0 &&
778 thr_keycreate(&handlers_key, free) != 0) {
779 mutex_unlock(&handlers_key_lock);
780 return NULL;
781 }
782 mutex_unlock(&handlers_key_lock);
783 if (!ptr) {
784 if ((ptr = (struct fex_handler_data *)
785 malloc(sizeof(fex_handler_t))) == NULL) {
786 return NULL;
787 }
788 if (thr_setspecific(handlers_key, (void *)ptr) != 0) {
789 (void)free(ptr);
790 return NULL;
791 }
792 /* initialize to FEX_NOHANDLER if trap is enabled,
793 FEX_NONSTOP if trap is disabled */
794 __fenv_getfsr(&fsr);
795 te = (int)__fenv_get_te(fsr);
796 for (i = 0; i < FEX_NUM_EXC; i++)
797 ptr[i].__mode = ((te & te_bit[i])? FEX_NOHANDLER : FEX_NONSTOP);
798 }
799 return ptr;
800 }
801 }
802
803 /*
804 * Update the trap enable bits according to the selected modes
805 */
806 void
807 __fex_update_te()
808 {
809 struct fex_handler_data *thr_handlers;
810 struct sigaction act, tmpact;
811 sigset_t blocked;
812 unsigned long fsr;
813 int te;
814
815 /* determine which traps are needed */
816 thr_handlers = __fex_get_thr_handlers();
817 __fenv_getfsr(&fsr);
818 te = __fex_te_needed(thr_handlers, fsr);
819
820 /* install __fex_hdlr as necessary */
821 if (!hdlr_installed && te) {
822 act.sa_handler = __fex_hdlr;
823 sigemptyset(&act.sa_mask);
824 act.sa_flags = SA_SIGINFO;
825 sigaction(SIGFPE, &act, &tmpact);
826 if (tmpact.sa_handler != __fex_hdlr)
827 {
828 mutex_lock(&hdlr_lock);
829 oact = tmpact;
830 mutex_unlock(&hdlr_lock);
831 }
832 hdlr_installed = 1;
833 }
834
835 /* set the new trap enable bits (only if SIGFPE is not blocked) */
836 if (sigprocmask(0, NULL, &blocked) == 0 &&
837 !sigismember(&blocked, SIGFPE)) {
838 __fenv_set_te(fsr, te);
839 __fenv_setfsr(&fsr);
840 }
841
842 /* synchronize with libmtsk */
843 __mt_fex_sync = __fex_sync_with_libmtsk;
844
845 #ifdef LIBM_MT_FEX_SYNC
846 /* synchronize with other projects */
847 __libm_mt_fex_sync = __fex_sync_with_threads;
848 #endif
849 }