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TOMOYO Linux Cross Reference
Linux/arch/mips/kernel/signal.c

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 1991, 1992  Linus Torvalds
  7  * Copyright (C) 1994 - 2000  Ralf Baechle
  8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  9  */
 10 #include <linux/cache.h>
 11 #include <linux/context_tracking.h>
 12 #include <linux/irqflags.h>
 13 #include <linux/sched.h>
 14 #include <linux/mm.h>
 15 #include <linux/personality.h>
 16 #include <linux/smp.h>
 17 #include <linux/kernel.h>
 18 #include <linux/signal.h>
 19 #include <linux/errno.h>
 20 #include <linux/wait.h>
 21 #include <linux/ptrace.h>
 22 #include <linux/unistd.h>
 23 #include <linux/compiler.h>
 24 #include <linux/syscalls.h>
 25 #include <linux/uaccess.h>
 26 #include <linux/tracehook.h>
 27 
 28 #include <asm/abi.h>
 29 #include <asm/asm.h>
 30 #include <linux/bitops.h>
 31 #include <asm/cacheflush.h>
 32 #include <asm/fpu.h>
 33 #include <asm/sim.h>
 34 #include <asm/ucontext.h>
 35 #include <asm/cpu-features.h>
 36 #include <asm/war.h>
 37 #include <asm/vdso.h>
 38 #include <asm/dsp.h>
 39 #include <asm/inst.h>
 40 
 41 #include "signal-common.h"
 42 
 43 static int (*save_fp_context)(struct sigcontext __user *sc);
 44 static int (*restore_fp_context)(struct sigcontext __user *sc);
 45 
 46 extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
 47 extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
 48 
 49 extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
 50 extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
 51 
 52 struct sigframe {
 53         u32 sf_ass[4];          /* argument save space for o32 */
 54         u32 sf_pad[2];          /* Was: signal trampoline */
 55         struct sigcontext sf_sc;
 56         sigset_t sf_mask;
 57 };
 58 
 59 struct rt_sigframe {
 60         u32 rs_ass[4];          /* argument save space for o32 */
 61         u32 rs_pad[2];          /* Was: signal trampoline */
 62         struct siginfo rs_info;
 63         struct ucontext rs_uc;
 64 };
 65 
 66 /*
 67  * Helper routines
 68  */
 69 static int protected_save_fp_context(struct sigcontext __user *sc)
 70 {
 71         int err;
 72         while (1) {
 73                 lock_fpu_owner();
 74                 own_fpu_inatomic(1);
 75                 err = save_fp_context(sc); /* this might fail */
 76                 unlock_fpu_owner();
 77                 if (likely(!err))
 78                         break;
 79                 /* touch the sigcontext and try again */
 80                 err = __put_user(0, &sc->sc_fpregs[0]) |
 81                         __put_user(0, &sc->sc_fpregs[31]) |
 82                         __put_user(0, &sc->sc_fpc_csr);
 83                 if (err)
 84                         break;  /* really bad sigcontext */
 85         }
 86         return err;
 87 }
 88 
 89 static int protected_restore_fp_context(struct sigcontext __user *sc)
 90 {
 91         int err, tmp __maybe_unused;
 92         while (1) {
 93                 lock_fpu_owner();
 94                 own_fpu_inatomic(0);
 95                 err = restore_fp_context(sc); /* this might fail */
 96                 unlock_fpu_owner();
 97                 if (likely(!err))
 98                         break;
 99                 /* touch the sigcontext and try again */
100                 err = __get_user(tmp, &sc->sc_fpregs[0]) |
101                         __get_user(tmp, &sc->sc_fpregs[31]) |
102                         __get_user(tmp, &sc->sc_fpc_csr);
103                 if (err)
104                         break;  /* really bad sigcontext */
105         }
106         return err;
107 }
108 
109 int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
110 {
111         int err = 0;
112         int i;
113         unsigned int used_math;
114 
115         err |= __put_user(regs->cp0_epc, &sc->sc_pc);
116 
117         err |= __put_user(0, &sc->sc_regs[0]);
118         for (i = 1; i < 32; i++)
119                 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
120 
121 #ifdef CONFIG_CPU_HAS_SMARTMIPS
122         err |= __put_user(regs->acx, &sc->sc_acx);
123 #endif
124         err |= __put_user(regs->hi, &sc->sc_mdhi);
125         err |= __put_user(regs->lo, &sc->sc_mdlo);
126         if (cpu_has_dsp) {
127                 err |= __put_user(mfhi1(), &sc->sc_hi1);
128                 err |= __put_user(mflo1(), &sc->sc_lo1);
129                 err |= __put_user(mfhi2(), &sc->sc_hi2);
130                 err |= __put_user(mflo2(), &sc->sc_lo2);
131                 err |= __put_user(mfhi3(), &sc->sc_hi3);
132                 err |= __put_user(mflo3(), &sc->sc_lo3);
133                 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
134         }
135 
136         used_math = !!used_math();
137         err |= __put_user(used_math, &sc->sc_used_math);
138 
139         if (used_math) {
140                 /*
141                  * Save FPU state to signal context. Signal handler
142                  * will "inherit" current FPU state.
143                  */
144                 err |= protected_save_fp_context(sc);
145         }
146         return err;
147 }
148 
149 int fpcsr_pending(unsigned int __user *fpcsr)
150 {
151         int err, sig = 0;
152         unsigned int csr, enabled;
153 
154         err = __get_user(csr, fpcsr);
155         enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
156         /*
157          * If the signal handler set some FPU exceptions, clear it and
158          * send SIGFPE.
159          */
160         if (csr & enabled) {
161                 csr &= ~enabled;
162                 err |= __put_user(csr, fpcsr);
163                 sig = SIGFPE;
164         }
165         return err ?: sig;
166 }
167 
168 static int
169 check_and_restore_fp_context(struct sigcontext __user *sc)
170 {
171         int err, sig;
172 
173         err = sig = fpcsr_pending(&sc->sc_fpc_csr);
174         if (err > 0)
175                 err = 0;
176         err |= protected_restore_fp_context(sc);
177         return err ?: sig;
178 }
179 
180 int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
181 {
182         unsigned int used_math;
183         unsigned long treg;
184         int err = 0;
185         int i;
186 
187         /* Always make any pending restarted system calls return -EINTR */
188         current_thread_info()->restart_block.fn = do_no_restart_syscall;
189 
190         err |= __get_user(regs->cp0_epc, &sc->sc_pc);
191 
192 #ifdef CONFIG_CPU_HAS_SMARTMIPS
193         err |= __get_user(regs->acx, &sc->sc_acx);
194 #endif
195         err |= __get_user(regs->hi, &sc->sc_mdhi);
196         err |= __get_user(regs->lo, &sc->sc_mdlo);
197         if (cpu_has_dsp) {
198                 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
199                 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
200                 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
201                 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
202                 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
203                 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
204                 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
205         }
206 
207         for (i = 1; i < 32; i++)
208                 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
209 
210         err |= __get_user(used_math, &sc->sc_used_math);
211         conditional_used_math(used_math);
212 
213         if (used_math) {
214                 /* restore fpu context if we have used it before */
215                 if (!err)
216                         err = check_and_restore_fp_context(sc);
217         } else {
218                 /* signal handler may have used FPU.  Give it up. */
219                 lose_fpu(0);
220         }
221 
222         return err;
223 }
224 
225 void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
226                           size_t frame_size)
227 {
228         unsigned long sp;
229 
230         /* Default to using normal stack */
231         sp = regs->regs[29];
232 
233         /*
234          * FPU emulator may have it's own trampoline active just
235          * above the user stack, 16-bytes before the next lowest
236          * 16 byte boundary.  Try to avoid trashing it.
237          */
238         sp -= 32;
239 
240         /* This is the X/Open sanctioned signal stack switching.  */
241         if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
242                 sp = current->sas_ss_sp + current->sas_ss_size;
243 
244         return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
245 }
246 
247 /*
248  * Atomically swap in the new signal mask, and wait for a signal.
249  */
250 
251 #ifdef CONFIG_TRAD_SIGNALS
252 SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset)
253 {
254         return sys_rt_sigsuspend(uset, sizeof(sigset_t));
255 }
256 #endif
257 
258 #ifdef CONFIG_TRAD_SIGNALS
259 SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
260         struct sigaction __user *, oact)
261 {
262         struct k_sigaction new_ka, old_ka;
263         int ret;
264         int err = 0;
265 
266         if (act) {
267                 old_sigset_t mask;
268 
269                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
270                         return -EFAULT;
271                 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
272                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
273                 err |= __get_user(mask, &act->sa_mask.sig[0]);
274                 if (err)
275                         return -EFAULT;
276 
277                 siginitset(&new_ka.sa.sa_mask, mask);
278         }
279 
280         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
281 
282         if (!ret && oact) {
283                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
284                         return -EFAULT;
285                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
286                 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
287                 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
288                 err |= __put_user(0, &oact->sa_mask.sig[1]);
289                 err |= __put_user(0, &oact->sa_mask.sig[2]);
290                 err |= __put_user(0, &oact->sa_mask.sig[3]);
291                 if (err)
292                         return -EFAULT;
293         }
294 
295         return ret;
296 }
297 #endif
298 
299 #ifdef CONFIG_TRAD_SIGNALS
300 asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
301 {
302         struct sigframe __user *frame;
303         sigset_t blocked;
304         int sig;
305 
306         frame = (struct sigframe __user *) regs.regs[29];
307         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
308                 goto badframe;
309         if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
310                 goto badframe;
311 
312         set_current_blocked(&blocked);
313 
314         sig = restore_sigcontext(&regs, &frame->sf_sc);
315         if (sig < 0)
316                 goto badframe;
317         else if (sig)
318                 force_sig(sig, current);
319 
320         /*
321          * Don't let your children do this ...
322          */
323         __asm__ __volatile__(
324                 "move\t$29, %0\n\t"
325                 "j\tsyscall_exit"
326                 :/* no outputs */
327                 :"r" (&regs));
328         /* Unreached */
329 
330 badframe:
331         force_sig(SIGSEGV, current);
332 }
333 #endif /* CONFIG_TRAD_SIGNALS */
334 
335 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
336 {
337         struct rt_sigframe __user *frame;
338         sigset_t set;
339         int sig;
340 
341         frame = (struct rt_sigframe __user *) regs.regs[29];
342         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
343                 goto badframe;
344         if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
345                 goto badframe;
346 
347         set_current_blocked(&set);
348 
349         sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
350         if (sig < 0)
351                 goto badframe;
352         else if (sig)
353                 force_sig(sig, current);
354 
355         if (restore_altstack(&frame->rs_uc.uc_stack))
356                 goto badframe;
357 
358         /*
359          * Don't let your children do this ...
360          */
361         __asm__ __volatile__(
362                 "move\t$29, %0\n\t"
363                 "j\tsyscall_exit"
364                 :/* no outputs */
365                 :"r" (&regs));
366         /* Unreached */
367 
368 badframe:
369         force_sig(SIGSEGV, current);
370 }
371 
372 #ifdef CONFIG_TRAD_SIGNALS
373 static int setup_frame(void *sig_return, struct k_sigaction *ka,
374                        struct pt_regs *regs, int signr, sigset_t *set)
375 {
376         struct sigframe __user *frame;
377         int err = 0;
378 
379         frame = get_sigframe(ka, regs, sizeof(*frame));
380         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
381                 goto give_sigsegv;
382 
383         err |= setup_sigcontext(regs, &frame->sf_sc);
384         err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
385         if (err)
386                 goto give_sigsegv;
387 
388         /*
389          * Arguments to signal handler:
390          *
391          *   a0 = signal number
392          *   a1 = 0 (should be cause)
393          *   a2 = pointer to struct sigcontext
394          *
395          * $25 and c0_epc point to the signal handler, $29 points to the
396          * struct sigframe.
397          */
398         regs->regs[ 4] = signr;
399         regs->regs[ 5] = 0;
400         regs->regs[ 6] = (unsigned long) &frame->sf_sc;
401         regs->regs[29] = (unsigned long) frame;
402         regs->regs[31] = (unsigned long) sig_return;
403         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
404 
405         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
406                current->comm, current->pid,
407                frame, regs->cp0_epc, regs->regs[31]);
408         return 0;
409 
410 give_sigsegv:
411         force_sigsegv(signr, current);
412         return -EFAULT;
413 }
414 #endif
415 
416 static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
417                           struct pt_regs *regs, int signr, sigset_t *set,
418                           siginfo_t *info)
419 {
420         struct rt_sigframe __user *frame;
421         int err = 0;
422 
423         frame = get_sigframe(ka, regs, sizeof(*frame));
424         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
425                 goto give_sigsegv;
426 
427         /* Create siginfo.  */
428         err |= copy_siginfo_to_user(&frame->rs_info, info);
429 
430         /* Create the ucontext.  */
431         err |= __put_user(0, &frame->rs_uc.uc_flags);
432         err |= __put_user(NULL, &frame->rs_uc.uc_link);
433         err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
434         err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
435         err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
436 
437         if (err)
438                 goto give_sigsegv;
439 
440         /*
441          * Arguments to signal handler:
442          *
443          *   a0 = signal number
444          *   a1 = 0 (should be cause)
445          *   a2 = pointer to ucontext
446          *
447          * $25 and c0_epc point to the signal handler, $29 points to
448          * the struct rt_sigframe.
449          */
450         regs->regs[ 4] = signr;
451         regs->regs[ 5] = (unsigned long) &frame->rs_info;
452         regs->regs[ 6] = (unsigned long) &frame->rs_uc;
453         regs->regs[29] = (unsigned long) frame;
454         regs->regs[31] = (unsigned long) sig_return;
455         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
456 
457         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
458                current->comm, current->pid,
459                frame, regs->cp0_epc, regs->regs[31]);
460 
461         return 0;
462 
463 give_sigsegv:
464         force_sigsegv(signr, current);
465         return -EFAULT;
466 }
467 
468 struct mips_abi mips_abi = {
469 #ifdef CONFIG_TRAD_SIGNALS
470         .setup_frame    = setup_frame,
471         .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
472 #endif
473         .setup_rt_frame = setup_rt_frame,
474         .rt_signal_return_offset =
475                 offsetof(struct mips_vdso, rt_signal_trampoline),
476         .restart        = __NR_restart_syscall
477 };
478 
479 static void handle_signal(unsigned long sig, siginfo_t *info,
480         struct k_sigaction *ka, struct pt_regs *regs)
481 {
482         sigset_t *oldset = sigmask_to_save();
483         int ret;
484         struct mips_abi *abi = current->thread.abi;
485 #ifdef CONFIG_CPU_MICROMIPS
486         void *vdso;
487         unsigned int tmp = (unsigned int)current->mm->context.vdso;
488 
489         set_isa16_mode(tmp);
490         vdso = (void *)tmp;
491 #else
492         void *vdso = current->mm->context.vdso;
493 #endif
494 
495         if (regs->regs[0]) {
496                 switch(regs->regs[2]) {
497                 case ERESTART_RESTARTBLOCK:
498                 case ERESTARTNOHAND:
499                         regs->regs[2] = EINTR;
500                         break;
501                 case ERESTARTSYS:
502                         if (!(ka->sa.sa_flags & SA_RESTART)) {
503                                 regs->regs[2] = EINTR;
504                                 break;
505                         }
506                 /* fallthrough */
507                 case ERESTARTNOINTR:
508                         regs->regs[7] = regs->regs[26];
509                         regs->regs[2] = regs->regs[0];
510                         regs->cp0_epc -= 4;
511                 }
512 
513                 regs->regs[0] = 0;              /* Don't deal with this again.  */
514         }
515 
516         if (sig_uses_siginfo(ka))
517                 ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
518                                           ka, regs, sig, oldset, info);
519         else
520                 ret = abi->setup_frame(vdso + abi->signal_return_offset,
521                                        ka, regs, sig, oldset);
522 
523         if (ret)
524                 return;
525 
526         signal_delivered(sig, info, ka, regs, 0);
527 }
528 
529 static void do_signal(struct pt_regs *regs)
530 {
531         struct k_sigaction ka;
532         siginfo_t info;
533         int signr;
534 
535         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
536         if (signr > 0) {
537                 /* Whee!  Actually deliver the signal.  */
538                 handle_signal(signr, &info, &ka, regs);
539                 return;
540         }
541 
542         if (regs->regs[0]) {
543                 switch (regs->regs[2]) {
544                 case ERESTARTNOHAND:
545                 case ERESTARTSYS:
546                 case ERESTARTNOINTR:
547                         regs->regs[2] = regs->regs[0];
548                         regs->regs[7] = regs->regs[26];
549                         regs->cp0_epc -= 4;
550                         break;
551 
552                 case ERESTART_RESTARTBLOCK:
553                         regs->regs[2] = current->thread.abi->restart;
554                         regs->regs[7] = regs->regs[26];
555                         regs->cp0_epc -= 4;
556                         break;
557                 }
558                 regs->regs[0] = 0;      /* Don't deal with this again.  */
559         }
560 
561         /*
562          * If there's no signal to deliver, we just put the saved sigmask
563          * back
564          */
565         restore_saved_sigmask();
566 }
567 
568 /*
569  * notification of userspace execution resumption
570  * - triggered by the TIF_WORK_MASK flags
571  */
572 asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
573         __u32 thread_info_flags)
574 {
575         local_irq_enable();
576 
577         user_exit();
578 
579         /* deal with pending signal delivery */
580         if (thread_info_flags & _TIF_SIGPENDING)
581                 do_signal(regs);
582 
583         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
584                 clear_thread_flag(TIF_NOTIFY_RESUME);
585                 tracehook_notify_resume(regs);
586         }
587 
588         user_enter();
589 }
590 
591 #ifdef CONFIG_SMP
592 static int smp_save_fp_context(struct sigcontext __user *sc)
593 {
594         return raw_cpu_has_fpu
595                ? _save_fp_context(sc)
596                : fpu_emulator_save_context(sc);
597 }
598 
599 static int smp_restore_fp_context(struct sigcontext __user *sc)
600 {
601         return raw_cpu_has_fpu
602                ? _restore_fp_context(sc)
603                : fpu_emulator_restore_context(sc);
604 }
605 #endif
606 
607 static int signal_setup(void)
608 {
609 #ifdef CONFIG_SMP
610         /* For now just do the cpu_has_fpu check when the functions are invoked */
611         save_fp_context = smp_save_fp_context;
612         restore_fp_context = smp_restore_fp_context;
613 #else
614         if (cpu_has_fpu) {
615                 save_fp_context = _save_fp_context;
616                 restore_fp_context = _restore_fp_context;
617         } else {
618                 save_fp_context = fpu_emulator_save_context;
619                 restore_fp_context = fpu_emulator_restore_context;
620         }
621 #endif
622 
623         return 0;
624 }
625 
626 arch_initcall(signal_setup);
627 

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