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Linux/arch/mn10300/kernel/signal.c

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  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>
 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>
 25 #include <linux/tracehook.h>
 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(&current->sighand->siglock);
 43         current->saved_sigmask = current->blocked;
 44         siginitset(&current->blocked, mask);
 45         recalc_sigpending();
 46         spin_unlock_irq(&current->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                     __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 70                     __get_user(mask, &act->sa_mask))
 71                         return -EFAULT;
 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                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 82                     __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 83                         return -EFAULT;
 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, current_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         /* Always make any pending restarted system calls return -EINTR */
106         current_thread_info()->restart_block.fn = do_no_restart_syscall;
107 
108         if (is_using_fpu(current))
109                 fpu_kill_state(current);
110 
111 #define COPY(x) err |= __get_user(regs->x, &sc->x)
112         COPY(d1); COPY(d2); COPY(d3);
113         COPY(a0); COPY(a1); COPY(a2); COPY(a3);
114         COPY(e0); COPY(e1); COPY(e2); COPY(e3);
115         COPY(e4); COPY(e5); COPY(e6); COPY(e7);
116         COPY(lar); COPY(lir);
117         COPY(mdr); COPY(mdrq);
118         COPY(mcvf); COPY(mcrl); COPY(mcrh);
119         COPY(sp); COPY(pc);
120 #undef COPY
121 
122         {
123                 unsigned int tmpflags;
124 #ifndef CONFIG_MN10300_USING_JTAG
125 #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
126                    EPSW_T | EPSW_nAR)
127 #else
128 #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
129                    EPSW_nAR)
130 #endif
131                 err |= __get_user(tmpflags, &sc->epsw);
132                 regs->epsw = (regs->epsw & ~USER_EPSW) |
133                   (tmpflags & USER_EPSW);
134                 regs->orig_d0 = -1;             /* disable syscall checks */
135         }
136 
137         {
138                 struct fpucontext *buf;
139                 err |= __get_user(buf, &sc->fpucontext);
140                 if (buf) {
141                         if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
142                                 goto badframe;
143                         err |= fpu_restore_sigcontext(buf);
144                 }
145         }
146 
147         err |= __get_user(*_d0, &sc->d0);
148         return err;
149 
150 badframe:
151         return 1;
152 }
153 
154 /*
155  * standard signal return syscall
156  */
157 asmlinkage long sys_sigreturn(void)
158 {
159         struct sigframe __user *frame;
160         sigset_t set;
161         long d0;
162 
163         frame = (struct sigframe __user *) current_frame()->sp;
164         if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
165                 goto badframe;
166         if (__get_user(set.sig[0], &frame->sc.oldmask))
167                 goto badframe;
168 
169         if (_NSIG_WORDS > 1 &&
170             __copy_from_user(&set.sig[1], &frame->extramask,
171                              sizeof(frame->extramask)))
172                 goto badframe;
173 
174         sigdelsetmask(&set, ~_BLOCKABLE);
175         spin_lock_irq(&current->sighand->siglock);
176         current->blocked = set;
177         recalc_sigpending();
178         spin_unlock_irq(&current->sighand->siglock);
179 
180         if (restore_sigcontext(current_frame(), &frame->sc, &d0))
181                 goto badframe;
182 
183         return d0;
184 
185 badframe:
186         force_sig(SIGSEGV, current);
187         return 0;
188 }
189 
190 /*
191  * realtime signal return syscall
192  */
193 asmlinkage long sys_rt_sigreturn(void)
194 {
195         struct rt_sigframe __user *frame;
196         sigset_t set;
197         long d0;
198 
199         frame = (struct rt_sigframe __user *) current_frame()->sp;
200         if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
201                 goto badframe;
202         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
203                 goto badframe;
204 
205         sigdelsetmask(&set, ~_BLOCKABLE);
206         spin_lock_irq(&current->sighand->siglock);
207         current->blocked = set;
208         recalc_sigpending();
209         spin_unlock_irq(&current->sighand->siglock);
210 
211         if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
212                 goto badframe;
213 
214         if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
215             -EFAULT)
216                 goto badframe;
217 
218         return d0;
219 
220 badframe:
221         force_sig(SIGSEGV, current);
222         return 0;
223 }
224 
225 /*
226  * store the userspace context into a signal frame
227  */
228 static int setup_sigcontext(struct sigcontext __user *sc,
229                             struct fpucontext *fpuctx,
230                             struct pt_regs *regs,
231                             unsigned long mask)
232 {
233         int tmp, err = 0;
234 
235 #define COPY(x) err |= __put_user(regs->x, &sc->x)
236         COPY(d0); COPY(d1); COPY(d2); COPY(d3);
237         COPY(a0); COPY(a1); COPY(a2); COPY(a3);
238         COPY(e0); COPY(e1); COPY(e2); COPY(e3);
239         COPY(e4); COPY(e5); COPY(e6); COPY(e7);
240         COPY(lar); COPY(lir);
241         COPY(mdr); COPY(mdrq);
242         COPY(mcvf); COPY(mcrl); COPY(mcrh);
243         COPY(sp); COPY(epsw); COPY(pc);
244 #undef COPY
245 
246         tmp = fpu_setup_sigcontext(fpuctx);
247         if (tmp < 0)
248                 err = 1;
249         else
250                 err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);
251 
252         /* non-iBCS2 extensions.. */
253         err |= __put_user(mask, &sc->oldmask);
254 
255         return err;
256 }
257 
258 /*
259  * determine which stack to use..
260  */
261 static inline void __user *get_sigframe(struct k_sigaction *ka,
262                                         struct pt_regs *regs,
263                                         size_t frame_size)
264 {
265         unsigned long sp;
266 
267         /* default to using normal stack */
268         sp = regs->sp;
269 
270         /* this is the X/Open sanctioned signal stack switching.  */
271         if (ka->sa.sa_flags & SA_ONSTACK) {
272                 if (sas_ss_flags(sp) == 0)
273                         sp = current->sas_ss_sp + current->sas_ss_size;
274         }
275 
276         return (void __user *) ((sp - frame_size) & ~7UL);
277 }
278 
279 /*
280  * set up a normal signal frame
281  */
282 static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
283                        struct pt_regs *regs)
284 {
285         struct sigframe __user *frame;
286         int rsig;
287 
288         frame = get_sigframe(ka, regs, sizeof(*frame));
289 
290         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
291                 goto give_sigsegv;
292 
293         rsig = sig;
294         if (sig < 32 &&
295             current_thread_info()->exec_domain &&
296             current_thread_info()->exec_domain->signal_invmap)
297                 rsig = current_thread_info()->exec_domain->signal_invmap[sig];
298 
299         if (__put_user(rsig, &frame->sig) < 0 ||
300             __put_user(&frame->sc, &frame->psc) < 0)
301                 goto give_sigsegv;
302 
303         if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0]))
304                 goto give_sigsegv;
305 
306         if (_NSIG_WORDS > 1) {
307                 if (__copy_to_user(frame->extramask, &set->sig[1],
308                                    sizeof(frame->extramask)))
309                         goto give_sigsegv;
310         }
311 
312         /* set up to return from userspace.  If provided, use a stub already in
313          * userspace */
314         if (ka->sa.sa_flags & SA_RESTORER) {
315                 if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
316                         goto give_sigsegv;
317         } else {
318                 if (__put_user((void (*)(void))frame->retcode,
319                                &frame->pretcode))
320                         goto give_sigsegv;
321                 /* this is mov $,d0; syscall 0 */
322                 if (__put_user(0x2c, (char *)(frame->retcode + 0)) ||
323                     __put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) ||
324                     __put_user(0x00, (char *)(frame->retcode + 2)) ||
325                     __put_user(0xf0, (char *)(frame->retcode + 3)) ||
326                     __put_user(0xe0, (char *)(frame->retcode + 4)))
327                         goto give_sigsegv;
328                 flush_icache_range((unsigned long) frame->retcode,
329                                    (unsigned long) frame->retcode + 5);
330         }
331 
332         /* set up registers for signal handler */
333         regs->sp = (unsigned long) frame;
334         regs->pc = (unsigned long) ka->sa.sa_handler;
335         regs->d0 = sig;
336         regs->d1 = (unsigned long) &frame->sc;
337 
338         /* the tracer may want to single-step inside the handler */
339         if (test_thread_flag(TIF_SINGLESTEP))
340                 ptrace_notify(SIGTRAP);
341 
342 #if DEBUG_SIG
343         printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
344                sig, current->comm, current->pid, frame, regs->pc,
345                frame->pretcode);
346 #endif
347 
348         return 0;
349 
350 give_sigsegv:
351         force_sigsegv(sig, current);
352         return -EFAULT;
353 }
354 
355 /*
356  * set up a realtime signal frame
357  */
358 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
359                           sigset_t *set, struct pt_regs *regs)
360 {
361         struct rt_sigframe __user *frame;
362         int rsig;
363 
364         frame = get_sigframe(ka, regs, sizeof(*frame));
365 
366         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
367                 goto give_sigsegv;
368 
369         rsig = sig;
370         if (sig < 32 &&
371             current_thread_info()->exec_domain &&
372             current_thread_info()->exec_domain->signal_invmap)
373                 rsig = current_thread_info()->exec_domain->signal_invmap[sig];
374 
375         if (__put_user(rsig, &frame->sig) ||
376             __put_user(&frame->info, &frame->pinfo) ||
377             __put_user(&frame->uc, &frame->puc) ||
378             copy_siginfo_to_user(&frame->info, info))
379                 goto give_sigsegv;
380 
381         /* create the ucontext.  */
382         if (__put_user(0, &frame->uc.uc_flags) ||
383             __put_user(0, &frame->uc.uc_link) ||
384             __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
385             __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
386             __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
387             setup_sigcontext(&frame->uc.uc_mcontext,
388                              &frame->fpuctx, regs, set->sig[0]) ||
389             __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
390                 goto give_sigsegv;
391 
392         /* set up to return from userspace.  If provided, use a stub already in
393          * userspace */
394         if (ka->sa.sa_flags & SA_RESTORER) {
395                 if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
396                         goto give_sigsegv;
397         } else {
398                 if (__put_user((void(*)(void))frame->retcode,
399                                &frame->pretcode) ||
400                     /* This is mov $,d0; syscall 0 */
401                     __put_user(0x2c, (char *)(frame->retcode + 0)) ||
402                     __put_user(__NR_rt_sigreturn,
403                                (char *)(frame->retcode + 1)) ||
404                     __put_user(0x00, (char *)(frame->retcode + 2)) ||
405                     __put_user(0xf0, (char *)(frame->retcode + 3)) ||
406                     __put_user(0xe0, (char *)(frame->retcode + 4)))
407                         goto give_sigsegv;
408 
409                 flush_icache_range((u_long) frame->retcode,
410                                    (u_long) frame->retcode + 5);
411         }
412 
413         /* Set up registers for signal handler */
414         regs->sp = (unsigned long) frame;
415         regs->pc = (unsigned long) ka->sa.sa_handler;
416         regs->d0 = sig;
417         regs->d1 = (long) &frame->info;
418 
419         /* the tracer may want to single-step inside the handler */
420         if (test_thread_flag(TIF_SINGLESTEP))
421                 ptrace_notify(SIGTRAP);
422 
423 #if DEBUG_SIG
424         printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
425                sig, current->comm, current->pid, frame, regs->pc,
426                frame->pretcode);
427 #endif
428 
429         return 0;
430 
431 give_sigsegv:
432         force_sigsegv(sig, current);
433         return -EFAULT;
434 }
435 
436 static inline void stepback(struct pt_regs *regs)
437 {
438         regs->pc -= 2;
439         regs->orig_d0 = -1;
440 }
441 
442 /*
443  * handle the actual delivery of a signal to userspace
444  */
445 static int handle_signal(int sig,
446                          siginfo_t *info, struct k_sigaction *ka,
447                          sigset_t *oldset, struct pt_regs *regs)
448 {
449         int ret;
450 
451         /* Are we from a system call? */
452         if (regs->orig_d0 >= 0) {
453                 /* If so, check system call restarting.. */
454                 switch (regs->d0) {
455                 case -ERESTART_RESTARTBLOCK:
456                 case -ERESTARTNOHAND:
457                         regs->d0 = -EINTR;
458                         break;
459 
460                 case -ERESTARTSYS:
461                         if (!(ka->sa.sa_flags & SA_RESTART)) {
462                                 regs->d0 = -EINTR;
463                                 break;
464                         }
465 
466                         /* fallthrough */
467                 case -ERESTARTNOINTR:
468                         regs->d0 = regs->orig_d0;
469                         stepback(regs);
470                 }
471         }
472 
473         /* Set up the stack frame */
474         if (ka->sa.sa_flags & SA_SIGINFO)
475                 ret = setup_rt_frame(sig, ka, info, oldset, regs);
476         else
477                 ret = setup_frame(sig, ka, oldset, regs);
478 
479         if (ret == 0) {
480                 spin_lock_irq(&current->sighand->siglock);
481                 sigorsets(&current->blocked, &current->blocked,
482                           &ka->sa.sa_mask);
483                 if (!(ka->sa.sa_flags & SA_NODEFER))
484                         sigaddset(&current->blocked, sig);
485                 recalc_sigpending();
486                 spin_unlock_irq(&current->sighand->siglock);
487         }
488 
489         return ret;
490 }
491 
492 /*
493  * handle a potential signal
494  */
495 static void do_signal(struct pt_regs *regs)
496 {
497         struct k_sigaction ka;
498         siginfo_t info;
499         sigset_t *oldset;
500         int signr;
501 
502         /* we want the common case to go fast, which is why we may in certain
503          * cases get here from kernel mode */
504         if (!user_mode(regs))
505                 return;
506 
507         if (test_thread_flag(TIF_RESTORE_SIGMASK))
508                 oldset = &current->saved_sigmask;
509         else
510                 oldset = &current->blocked;
511 
512         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
513         if (signr > 0) {
514                 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
515                         /* a signal was successfully delivered; the saved
516                          * sigmask will have been stored in the signal frame,
517                          * and will be restored by sigreturn, so we can simply
518                          * clear the TIF_RESTORE_SIGMASK flag */
519                         if (test_thread_flag(TIF_RESTORE_SIGMASK))
520                                 clear_thread_flag(TIF_RESTORE_SIGMASK);
521 
522                         tracehook_signal_handler(signr, &info, &ka, regs,
523                                                  test_thread_flag(TIF_SINGLESTEP));
524                 }
525 
526                 return;
527         }
528 
529         /* did we come from a system call? */
530         if (regs->orig_d0 >= 0) {
531                 /* restart the system call - no handlers present */
532                 switch (regs->d0) {
533                 case -ERESTARTNOHAND:
534                 case -ERESTARTSYS:
535                 case -ERESTARTNOINTR:
536                         regs->d0 = regs->orig_d0;
537                         stepback(regs);
538                         break;
539 
540                 case -ERESTART_RESTARTBLOCK:
541                         regs->d0 = __NR_restart_syscall;
542                         stepback(regs);
543                         break;
544                 }
545         }
546 
547         /* if there's no signal to deliver, we just put the saved sigmask
548          * back */
549         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
550                 clear_thread_flag(TIF_RESTORE_SIGMASK);
551                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
552         }
553 }
554 
555 /*
556  * notification of userspace execution resumption
557  * - triggered by current->work.notify_resume
558  */
559 asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
560 {
561         /* Pending single-step? */
562         if (thread_info_flags & _TIF_SINGLESTEP) {
563 #ifndef CONFIG_MN10300_USING_JTAG
564                 regs->epsw |= EPSW_T;
565                 clear_thread_flag(TIF_SINGLESTEP);
566 #else
567                 BUG(); /* no h/w single-step if using JTAG unit */
568 #endif
569         }
570 
571         /* deal with pending signal delivery */
572         if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
573                 do_signal(regs);
574 
575         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
576                 clear_thread_flag(TIF_NOTIFY_RESUME);
577                 tracehook_notify_resume(current_frame());
578                 if (current->replacement_session_keyring)
579                         key_replace_session_keyring();
580         }
581 }
582 

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