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b920de1b DH |
1 | /* MN10300 Signal handling |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/sched.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/smp.h> | |
b920de1b DH |
15 | #include <linux/kernel.h> |
16 | #include <linux/signal.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/wait.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/unistd.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/tty.h> | |
23 | #include <linux/personality.h> | |
24 | #include <linux/suspend.h> | |
5d289964 | 25 | #include <linux/tracehook.h> |
b920de1b DH |
26 | #include <asm/cacheflush.h> |
27 | #include <asm/ucontext.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/fpu.h> | |
30 | #include "sigframe.h" | |
31 | ||
32 | #define DEBUG_SIG 0 | |
33 | ||
34 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
35 | ||
36 | /* | |
37 | * atomically swap in the new signal mask, and wait for a signal. | |
38 | */ | |
39 | asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
40 | { | |
41 | mask &= _BLOCKABLE; | |
42 | spin_lock_irq(¤t->sighand->siglock); | |
43 | current->saved_sigmask = current->blocked; | |
44 | siginitset(¤t->blocked, mask); | |
45 | recalc_sigpending(); | |
46 | spin_unlock_irq(¤t->sighand->siglock); | |
47 | ||
48 | current->state = TASK_INTERRUPTIBLE; | |
49 | schedule(); | |
50 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
51 | return -ERESTARTNOHAND; | |
52 | } | |
53 | ||
54 | /* | |
55 | * set signal action syscall | |
56 | */ | |
57 | asmlinkage long sys_sigaction(int sig, | |
58 | const struct old_sigaction __user *act, | |
59 | struct old_sigaction __user *oact) | |
60 | { | |
61 | struct k_sigaction new_ka, old_ka; | |
62 | int ret; | |
63 | ||
64 | if (act) { | |
65 | old_sigset_t mask; | |
66 | if (verify_area(VERIFY_READ, act, sizeof(*act)) || | |
67 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
68 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
69 | return -EFAULT; | |
70 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
71 | __get_user(mask, &act->sa_mask); | |
72 | siginitset(&new_ka.sa.sa_mask, mask); | |
73 | } | |
74 | ||
75 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
76 | ||
77 | if (!ret && oact) { | |
78 | if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) || | |
79 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
80 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
81 | return -EFAULT; | |
82 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
83 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
84 | } | |
85 | ||
86 | return ret; | |
87 | } | |
88 | ||
89 | /* | |
90 | * set alternate signal stack syscall | |
91 | */ | |
92 | asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss) | |
93 | { | |
94 | return do_sigaltstack(uss, uoss, __frame->sp); | |
95 | } | |
96 | ||
97 | /* | |
98 | * do a signal return; undo the signal stack. | |
99 | */ | |
100 | static int restore_sigcontext(struct pt_regs *regs, | |
101 | struct sigcontext __user *sc, long *_d0) | |
102 | { | |
103 | unsigned int err = 0; | |
104 | ||
105 | if (is_using_fpu(current)) | |
106 | fpu_kill_state(current); | |
107 | ||
108 | #define COPY(x) err |= __get_user(regs->x, &sc->x) | |
109 | COPY(d1); COPY(d2); COPY(d3); | |
110 | COPY(a0); COPY(a1); COPY(a2); COPY(a3); | |
111 | COPY(e0); COPY(e1); COPY(e2); COPY(e3); | |
112 | COPY(e4); COPY(e5); COPY(e6); COPY(e7); | |
113 | COPY(lar); COPY(lir); | |
114 | COPY(mdr); COPY(mdrq); | |
115 | COPY(mcvf); COPY(mcrl); COPY(mcrh); | |
116 | COPY(sp); COPY(pc); | |
117 | #undef COPY | |
118 | ||
119 | { | |
120 | unsigned int tmpflags; | |
121 | #ifndef CONFIG_MN10300_USING_JTAG | |
122 | #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \ | |
123 | EPSW_T | EPSW_nAR) | |
124 | #else | |
125 | #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \ | |
126 | EPSW_nAR) | |
127 | #endif | |
128 | err |= __get_user(tmpflags, &sc->epsw); | |
129 | regs->epsw = (regs->epsw & ~USER_EPSW) | | |
130 | (tmpflags & USER_EPSW); | |
131 | regs->orig_d0 = -1; /* disable syscall checks */ | |
132 | } | |
133 | ||
134 | { | |
135 | struct fpucontext *buf; | |
136 | err |= __get_user(buf, &sc->fpucontext); | |
137 | if (buf) { | |
138 | if (verify_area(VERIFY_READ, buf, sizeof(*buf))) | |
139 | goto badframe; | |
140 | err |= fpu_restore_sigcontext(buf); | |
141 | } | |
142 | } | |
143 | ||
144 | err |= __get_user(*_d0, &sc->d0); | |
145 | return err; | |
146 | ||
147 | badframe: | |
148 | return 1; | |
149 | } | |
150 | ||
151 | /* | |
152 | * standard signal return syscall | |
153 | */ | |
154 | asmlinkage long sys_sigreturn(void) | |
155 | { | |
156 | struct sigframe __user *frame = (struct sigframe __user *) __frame->sp; | |
157 | sigset_t set; | |
158 | long d0; | |
159 | ||
160 | if (verify_area(VERIFY_READ, frame, sizeof(*frame))) | |
161 | goto badframe; | |
162 | if (__get_user(set.sig[0], &frame->sc.oldmask)) | |
163 | goto badframe; | |
164 | ||
165 | if (_NSIG_WORDS > 1 && | |
166 | __copy_from_user(&set.sig[1], &frame->extramask, | |
167 | sizeof(frame->extramask))) | |
168 | goto badframe; | |
169 | ||
170 | sigdelsetmask(&set, ~_BLOCKABLE); | |
171 | spin_lock_irq(¤t->sighand->siglock); | |
172 | current->blocked = set; | |
173 | recalc_sigpending(); | |
174 | spin_unlock_irq(¤t->sighand->siglock); | |
175 | ||
176 | if (restore_sigcontext(__frame, &frame->sc, &d0)) | |
177 | goto badframe; | |
178 | ||
179 | return d0; | |
180 | ||
181 | badframe: | |
182 | force_sig(SIGSEGV, current); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | /* | |
187 | * realtime signal return syscall | |
188 | */ | |
189 | asmlinkage long sys_rt_sigreturn(void) | |
190 | { | |
191 | struct rt_sigframe __user *frame = | |
192 | (struct rt_sigframe __user *) __frame->sp; | |
193 | sigset_t set; | |
194 | unsigned long d0; | |
195 | ||
196 | if (verify_area(VERIFY_READ, frame, sizeof(*frame))) | |
197 | goto badframe; | |
198 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
199 | goto badframe; | |
200 | ||
201 | sigdelsetmask(&set, ~_BLOCKABLE); | |
202 | spin_lock_irq(¤t->sighand->siglock); | |
203 | current->blocked = set; | |
204 | recalc_sigpending(); | |
205 | spin_unlock_irq(¤t->sighand->siglock); | |
206 | ||
207 | if (restore_sigcontext(__frame, &frame->uc.uc_mcontext, &d0)) | |
208 | goto badframe; | |
209 | ||
210 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, __frame->sp) == -EFAULT) | |
211 | goto badframe; | |
212 | ||
213 | return d0; | |
214 | ||
215 | badframe: | |
216 | force_sig(SIGSEGV, current); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* | |
221 | * store the userspace context into a signal frame | |
222 | */ | |
223 | static int setup_sigcontext(struct sigcontext __user *sc, | |
224 | struct fpucontext *fpuctx, | |
225 | struct pt_regs *regs, | |
226 | unsigned long mask) | |
227 | { | |
228 | int tmp, err = 0; | |
229 | ||
230 | #define COPY(x) err |= __put_user(regs->x, &sc->x) | |
231 | COPY(d0); COPY(d1); COPY(d2); COPY(d3); | |
232 | COPY(a0); COPY(a1); COPY(a2); COPY(a3); | |
233 | COPY(e0); COPY(e1); COPY(e2); COPY(e3); | |
234 | COPY(e4); COPY(e5); COPY(e6); COPY(e7); | |
235 | COPY(lar); COPY(lir); | |
236 | COPY(mdr); COPY(mdrq); | |
237 | COPY(mcvf); COPY(mcrl); COPY(mcrh); | |
238 | COPY(sp); COPY(epsw); COPY(pc); | |
239 | #undef COPY | |
240 | ||
241 | tmp = fpu_setup_sigcontext(fpuctx); | |
242 | if (tmp < 0) | |
243 | err = 1; | |
244 | else | |
245 | err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext); | |
246 | ||
247 | /* non-iBCS2 extensions.. */ | |
248 | err |= __put_user(mask, &sc->oldmask); | |
249 | ||
250 | return err; | |
251 | } | |
252 | ||
253 | /* | |
254 | * determine which stack to use.. | |
255 | */ | |
256 | static inline void __user *get_sigframe(struct k_sigaction *ka, | |
257 | struct pt_regs *regs, | |
258 | size_t frame_size) | |
259 | { | |
260 | unsigned long sp; | |
261 | ||
262 | /* default to using normal stack */ | |
263 | sp = regs->sp; | |
264 | ||
265 | /* this is the X/Open sanctioned signal stack switching. */ | |
266 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
4c03ee73 | 267 | if (sas_ss_flags(sp) == 0) |
b920de1b DH |
268 | sp = current->sas_ss_sp + current->sas_ss_size; |
269 | } | |
270 | ||
271 | return (void __user *) ((sp - frame_size) & ~7UL); | |
272 | } | |
273 | ||
274 | /* | |
275 | * set up a normal signal frame | |
276 | */ | |
277 | static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, | |
278 | struct pt_regs *regs) | |
279 | { | |
280 | struct sigframe __user *frame; | |
281 | int rsig; | |
282 | ||
283 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
284 | ||
285 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
286 | goto give_sigsegv; | |
287 | ||
288 | rsig = sig; | |
289 | if (sig < 32 && | |
290 | current_thread_info()->exec_domain && | |
291 | current_thread_info()->exec_domain->signal_invmap) | |
292 | rsig = current_thread_info()->exec_domain->signal_invmap[sig]; | |
293 | ||
294 | if (__put_user(rsig, &frame->sig) < 0 || | |
295 | __put_user(&frame->sc, &frame->psc) < 0) | |
296 | goto give_sigsegv; | |
297 | ||
298 | if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0])) | |
299 | goto give_sigsegv; | |
300 | ||
301 | if (_NSIG_WORDS > 1) { | |
302 | if (__copy_to_user(frame->extramask, &set->sig[1], | |
303 | sizeof(frame->extramask))) | |
304 | goto give_sigsegv; | |
305 | } | |
306 | ||
307 | /* set up to return from userspace. If provided, use a stub already in | |
308 | * userspace */ | |
309 | if (ka->sa.sa_flags & SA_RESTORER) { | |
310 | if (__put_user(ka->sa.sa_restorer, &frame->pretcode)) | |
311 | goto give_sigsegv; | |
312 | } else { | |
313 | if (__put_user((void (*)(void))frame->retcode, | |
314 | &frame->pretcode)) | |
315 | goto give_sigsegv; | |
316 | /* this is mov $,d0; syscall 0 */ | |
317 | if (__put_user(0x2c, (char *)(frame->retcode + 0)) || | |
318 | __put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) || | |
319 | __put_user(0x00, (char *)(frame->retcode + 2)) || | |
320 | __put_user(0xf0, (char *)(frame->retcode + 3)) || | |
321 | __put_user(0xe0, (char *)(frame->retcode + 4))) | |
322 | goto give_sigsegv; | |
323 | flush_icache_range((unsigned long) frame->retcode, | |
324 | (unsigned long) frame->retcode + 5); | |
325 | } | |
326 | ||
327 | /* set up registers for signal handler */ | |
328 | regs->sp = (unsigned long) frame; | |
329 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
330 | regs->d0 = sig; | |
331 | regs->d1 = (unsigned long) &frame->sc; | |
332 | ||
333 | set_fs(USER_DS); | |
334 | ||
335 | /* the tracer may want to single-step inside the handler */ | |
336 | if (test_thread_flag(TIF_SINGLESTEP)) | |
337 | ptrace_notify(SIGTRAP); | |
338 | ||
339 | #if DEBUG_SIG | |
340 | printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", | |
341 | sig, current->comm, current->pid, frame, regs->pc, | |
342 | frame->pretcode); | |
343 | #endif | |
344 | ||
345 | return 0; | |
346 | ||
347 | give_sigsegv: | |
348 | force_sig(SIGSEGV, current); | |
349 | return -EFAULT; | |
350 | } | |
351 | ||
352 | /* | |
353 | * set up a realtime signal frame | |
354 | */ | |
355 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
356 | sigset_t *set, struct pt_regs *regs) | |
357 | { | |
358 | struct rt_sigframe __user *frame; | |
359 | int rsig; | |
360 | ||
361 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
362 | ||
363 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
364 | goto give_sigsegv; | |
365 | ||
366 | rsig = sig; | |
367 | if (sig < 32 && | |
368 | current_thread_info()->exec_domain && | |
369 | current_thread_info()->exec_domain->signal_invmap) | |
370 | rsig = current_thread_info()->exec_domain->signal_invmap[sig]; | |
371 | ||
372 | if (__put_user(rsig, &frame->sig) || | |
373 | __put_user(&frame->info, &frame->pinfo) || | |
374 | __put_user(&frame->uc, &frame->puc) || | |
375 | copy_siginfo_to_user(&frame->info, info)) | |
376 | goto give_sigsegv; | |
377 | ||
378 | /* create the ucontext. */ | |
379 | if (__put_user(0, &frame->uc.uc_flags) || | |
380 | __put_user(0, &frame->uc.uc_link) || | |
381 | __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) || | |
382 | __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) || | |
383 | __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) || | |
384 | setup_sigcontext(&frame->uc.uc_mcontext, | |
385 | &frame->fpuctx, regs, set->sig[0]) || | |
386 | __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set))) | |
387 | goto give_sigsegv; | |
388 | ||
389 | /* set up to return from userspace. If provided, use a stub already in | |
390 | * userspace */ | |
391 | if (ka->sa.sa_flags & SA_RESTORER) { | |
392 | if (__put_user(ka->sa.sa_restorer, &frame->pretcode)) | |
393 | goto give_sigsegv; | |
394 | } else { | |
395 | if (__put_user((void(*)(void))frame->retcode, | |
396 | &frame->pretcode) || | |
397 | /* This is mov $,d0; syscall 0 */ | |
398 | __put_user(0x2c, (char *)(frame->retcode + 0)) || | |
399 | __put_user(__NR_rt_sigreturn, | |
400 | (char *)(frame->retcode + 1)) || | |
401 | __put_user(0x00, (char *)(frame->retcode + 2)) || | |
402 | __put_user(0xf0, (char *)(frame->retcode + 3)) || | |
403 | __put_user(0xe0, (char *)(frame->retcode + 4))) | |
404 | goto give_sigsegv; | |
405 | ||
406 | flush_icache_range((u_long) frame->retcode, | |
407 | (u_long) frame->retcode + 5); | |
408 | } | |
409 | ||
410 | /* Set up registers for signal handler */ | |
411 | regs->sp = (unsigned long) frame; | |
412 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
413 | regs->d0 = sig; | |
414 | regs->d1 = (long) &frame->info; | |
415 | ||
416 | set_fs(USER_DS); | |
417 | ||
418 | /* the tracer may want to single-step inside the handler */ | |
419 | if (test_thread_flag(TIF_SINGLESTEP)) | |
420 | ptrace_notify(SIGTRAP); | |
421 | ||
422 | #if DEBUG_SIG | |
423 | printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", | |
424 | sig, current->comm, current->pid, frame, regs->pc, | |
425 | frame->pretcode); | |
426 | #endif | |
427 | ||
428 | return 0; | |
429 | ||
430 | give_sigsegv: | |
431 | force_sig(SIGSEGV, current); | |
432 | return -EFAULT; | |
433 | } | |
434 | ||
435 | /* | |
436 | * handle the actual delivery of a signal to userspace | |
437 | */ | |
438 | static int handle_signal(int sig, | |
439 | siginfo_t *info, struct k_sigaction *ka, | |
440 | sigset_t *oldset, struct pt_regs *regs) | |
441 | { | |
442 | int ret; | |
443 | ||
444 | /* Are we from a system call? */ | |
445 | if (regs->orig_d0 >= 0) { | |
446 | /* If so, check system call restarting.. */ | |
447 | switch (regs->d0) { | |
448 | case -ERESTART_RESTARTBLOCK: | |
449 | case -ERESTARTNOHAND: | |
450 | regs->d0 = -EINTR; | |
451 | break; | |
452 | ||
453 | case -ERESTARTSYS: | |
454 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
455 | regs->d0 = -EINTR; | |
456 | break; | |
457 | } | |
458 | ||
459 | /* fallthrough */ | |
460 | case -ERESTARTNOINTR: | |
461 | regs->d0 = regs->orig_d0; | |
462 | regs->pc -= 2; | |
463 | } | |
464 | } | |
465 | ||
466 | /* Set up the stack frame */ | |
467 | if (ka->sa.sa_flags & SA_SIGINFO) | |
468 | ret = setup_rt_frame(sig, ka, info, oldset, regs); | |
469 | else | |
470 | ret = setup_frame(sig, ka, oldset, regs); | |
471 | ||
472 | if (ret == 0) { | |
473 | spin_lock_irq(¤t->sighand->siglock); | |
474 | sigorsets(¤t->blocked, ¤t->blocked, | |
475 | &ka->sa.sa_mask); | |
476 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
477 | sigaddset(¤t->blocked, sig); | |
478 | recalc_sigpending(); | |
479 | spin_unlock_irq(¤t->sighand->siglock); | |
480 | } | |
481 | ||
482 | return ret; | |
483 | } | |
484 | ||
485 | /* | |
486 | * handle a potential signal | |
487 | */ | |
488 | static void do_signal(struct pt_regs *regs) | |
489 | { | |
490 | struct k_sigaction ka; | |
491 | siginfo_t info; | |
492 | sigset_t *oldset; | |
493 | int signr; | |
494 | ||
495 | /* we want the common case to go fast, which is why we may in certain | |
496 | * cases get here from kernel mode */ | |
497 | if (!user_mode(regs)) | |
498 | return; | |
499 | ||
500 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
501 | oldset = ¤t->saved_sigmask; | |
502 | else | |
503 | oldset = ¤t->blocked; | |
504 | ||
505 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
506 | if (signr > 0) { | |
507 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { | |
508 | /* a signal was successfully delivered; the saved | |
509 | * sigmask will have been stored in the signal frame, | |
510 | * and will be restored by sigreturn, so we can simply | |
511 | * clear the TIF_RESTORE_SIGMASK flag */ | |
512 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
513 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
5d289964 DH |
514 | |
515 | tracehook_signal_handler(signr, &info, &ka, regs, | |
516 | test_thread_flag(TIF_SINGLESTEP)); | |
b920de1b DH |
517 | } |
518 | ||
519 | return; | |
520 | } | |
521 | ||
522 | /* did we come from a system call? */ | |
523 | if (regs->orig_d0 >= 0) { | |
524 | /* restart the system call - no handlers present */ | |
525 | switch (regs->d0) { | |
526 | case -ERESTARTNOHAND: | |
527 | case -ERESTARTSYS: | |
528 | case -ERESTARTNOINTR: | |
529 | regs->d0 = regs->orig_d0; | |
530 | regs->pc -= 2; | |
531 | break; | |
532 | ||
533 | case -ERESTART_RESTARTBLOCK: | |
534 | regs->d0 = __NR_restart_syscall; | |
535 | regs->pc -= 2; | |
536 | break; | |
537 | } | |
538 | } | |
539 | ||
540 | /* if there's no signal to deliver, we just put the saved sigmask | |
541 | * back */ | |
542 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
543 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
544 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
545 | } | |
546 | } | |
547 | ||
548 | /* | |
549 | * notification of userspace execution resumption | |
550 | * - triggered by current->work.notify_resume | |
551 | */ | |
552 | asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags) | |
553 | { | |
554 | /* Pending single-step? */ | |
555 | if (thread_info_flags & _TIF_SINGLESTEP) { | |
556 | #ifndef CONFIG_MN10300_USING_JTAG | |
557 | regs->epsw |= EPSW_T; | |
558 | clear_thread_flag(TIF_SINGLESTEP); | |
559 | #else | |
560 | BUG(); /* no h/w single-step if using JTAG unit */ | |
561 | #endif | |
562 | } | |
563 | ||
564 | /* deal with pending signal delivery */ | |
565 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) | |
566 | do_signal(regs); | |
5d289964 DH |
567 | |
568 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
569 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
570 | tracehook_notify_resume(__frame); | |
ee18d64c DH |
571 | if (current->replacement_session_keyring) |
572 | key_replace_session_keyring(); | |
5d289964 | 573 | } |
b920de1b | 574 | } |