2 * linux/arch/arm/kernel/signal.c
4 * Copyright (C) 1995-2009 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/errno.h>
11 #include <linux/signal.h>
12 #include <linux/personality.h>
13 #include <linux/freezer.h>
14 #include <linux/uaccess.h>
15 #include <linux/tracehook.h>
18 #include <asm/cacheflush.h>
19 #include <asm/ucontext.h>
20 #include <asm/unistd.h>
25 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
28 * For ARM syscalls, we encode the syscall number into the instruction.
30 #define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
31 #define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
32 #define SWI_SYS_RESTART (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE)
35 * With EABI, the syscall number has to be loaded into r7.
37 #define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE))
38 #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
41 * For Thumb syscalls, we pass the syscall number via r7. We therefore
42 * need two 16-bit instructions.
44 #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE))
45 #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
47 const unsigned long sigreturn_codes[7] = {
48 MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
49 MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
53 * Either we support OABI only, or we have EABI with the OABI
54 * compat layer enabled. In the later case we don't know if
55 * user space is EABI or not, and if not we must not clobber r7.
56 * Always using the OABI syscall solves that issue and works for
59 const unsigned long syscall_restart_code[2] = {
60 SWI_SYS_RESTART, /* swi __NR_restart_syscall */
61 0xe49df004, /* ldr pc, [sp], #4 */
65 * atomically swap in the new signal mask, and wait for a signal.
67 asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
71 current->saved_sigmask = current->blocked;
74 siginitset(&blocked, mask);
75 set_current_blocked(&blocked);
77 current->state = TASK_INTERRUPTIBLE;
79 set_restore_sigmask();
80 return -ERESTARTNOHAND;
84 sys_sigaction(int sig, const struct old_sigaction __user *act,
85 struct old_sigaction __user *oact)
87 struct k_sigaction new_ka, old_ka;
92 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
93 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
94 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
96 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
97 __get_user(mask, &act->sa_mask);
98 siginitset(&new_ka.sa.sa_mask, mask);
101 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
104 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
105 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
106 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
108 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
109 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
116 static int preserve_crunch_context(struct crunch_sigframe __user *frame)
118 char kbuf[sizeof(*frame) + 8];
119 struct crunch_sigframe *kframe;
121 /* the crunch context must be 64 bit aligned */
122 kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7);
123 kframe->magic = CRUNCH_MAGIC;
124 kframe->size = CRUNCH_STORAGE_SIZE;
125 crunch_task_copy(current_thread_info(), &kframe->storage);
126 return __copy_to_user(frame, kframe, sizeof(*frame));
129 static int restore_crunch_context(struct crunch_sigframe __user *frame)
131 char kbuf[sizeof(*frame) + 8];
132 struct crunch_sigframe *kframe;
134 /* the crunch context must be 64 bit aligned */
135 kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7);
136 if (__copy_from_user(kframe, frame, sizeof(*frame)))
138 if (kframe->magic != CRUNCH_MAGIC ||
139 kframe->size != CRUNCH_STORAGE_SIZE)
141 crunch_task_restore(current_thread_info(), &kframe->storage);
148 static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame)
150 char kbuf[sizeof(*frame) + 8];
151 struct iwmmxt_sigframe *kframe;
153 /* the iWMMXt context must be 64 bit aligned */
154 kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
155 kframe->magic = IWMMXT_MAGIC;
156 kframe->size = IWMMXT_STORAGE_SIZE;
157 iwmmxt_task_copy(current_thread_info(), &kframe->storage);
158 return __copy_to_user(frame, kframe, sizeof(*frame));
161 static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
163 char kbuf[sizeof(*frame) + 8];
164 struct iwmmxt_sigframe *kframe;
166 /* the iWMMXt context must be 64 bit aligned */
167 kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
168 if (__copy_from_user(kframe, frame, sizeof(*frame)))
170 if (kframe->magic != IWMMXT_MAGIC ||
171 kframe->size != IWMMXT_STORAGE_SIZE)
173 iwmmxt_task_restore(current_thread_info(), &kframe->storage);
181 static int preserve_vfp_context(struct vfp_sigframe __user *frame)
183 struct thread_info *thread = current_thread_info();
184 struct vfp_hard_struct *h = &thread->vfpstate.hard;
185 const unsigned long magic = VFP_MAGIC;
186 const unsigned long size = VFP_STORAGE_SIZE;
189 vfp_sync_hwstate(thread);
190 __put_user_error(magic, &frame->magic, err);
191 __put_user_error(size, &frame->size, err);
194 * Copy the floating point registers. There can be unused
195 * registers see asm/hwcap.h for details.
197 err |= __copy_to_user(&frame->ufp.fpregs, &h->fpregs,
200 * Copy the status and control register.
202 __put_user_error(h->fpscr, &frame->ufp.fpscr, err);
205 * Copy the exception registers.
207 __put_user_error(h->fpexc, &frame->ufp_exc.fpexc, err);
208 __put_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
209 __put_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
211 return err ? -EFAULT : 0;
214 static int restore_vfp_context(struct vfp_sigframe __user *frame)
216 struct thread_info *thread = current_thread_info();
217 struct vfp_hard_struct *h = &thread->vfpstate.hard;
223 __get_user_error(magic, &frame->magic, err);
224 __get_user_error(size, &frame->size, err);
228 if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
231 vfp_flush_hwstate(thread);
234 * Copy the floating point registers. There can be unused
235 * registers see asm/hwcap.h for details.
237 err |= __copy_from_user(&h->fpregs, &frame->ufp.fpregs,
240 * Copy the status and control register.
242 __get_user_error(h->fpscr, &frame->ufp.fpscr, err);
245 * Sanitise and restore the exception registers.
247 __get_user_error(fpexc, &frame->ufp_exc.fpexc, err);
248 /* Ensure the VFP is enabled. */
250 /* Ensure FPINST2 is invalid and the exception flag is cleared. */
251 fpexc &= ~(FPEXC_EX | FPEXC_FP2V);
254 __get_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
255 __get_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
257 return err ? -EFAULT : 0;
263 * Do a signal return; undo the signal stack. These are aligned to 64-bit.
267 unsigned long retcode[2];
275 static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
277 struct aux_sigframe __user *aux;
281 err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
283 sigdelsetmask(&set, ~_BLOCKABLE);
284 set_current_blocked(&set);
287 __get_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err);
288 __get_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err);
289 __get_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err);
290 __get_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err);
291 __get_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err);
292 __get_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err);
293 __get_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err);
294 __get_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err);
295 __get_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err);
296 __get_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err);
297 __get_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err);
298 __get_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err);
299 __get_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err);
300 __get_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err);
301 __get_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err);
302 __get_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err);
303 __get_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err);
305 err |= !valid_user_regs(regs);
307 aux = (struct aux_sigframe __user *) sf->uc.uc_regspace;
310 err |= restore_crunch_context(&aux->crunch);
313 if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
314 err |= restore_iwmmxt_context(&aux->iwmmxt);
318 err |= restore_vfp_context(&aux->vfp);
324 asmlinkage int sys_sigreturn(struct pt_regs *regs)
326 struct sigframe __user *frame;
328 /* Always make any pending restarted system calls return -EINTR */
329 current_thread_info()->restart_block.fn = do_no_restart_syscall;
332 * Since we stacked the signal on a 64-bit boundary,
333 * then 'sp' should be word aligned here. If it's
334 * not, then the user is trying to mess with us.
336 if (regs->ARM_sp & 7)
339 frame = (struct sigframe __user *)regs->ARM_sp;
341 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
344 if (restore_sigframe(regs, frame))
350 force_sig(SIGSEGV, current);
354 asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
356 struct rt_sigframe __user *frame;
358 /* Always make any pending restarted system calls return -EINTR */
359 current_thread_info()->restart_block.fn = do_no_restart_syscall;
362 * Since we stacked the signal on a 64-bit boundary,
363 * then 'sp' should be word aligned here. If it's
364 * not, then the user is trying to mess with us.
366 if (regs->ARM_sp & 7)
369 frame = (struct rt_sigframe __user *)regs->ARM_sp;
371 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
374 if (restore_sigframe(regs, &frame->sig))
377 if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT)
383 force_sig(SIGSEGV, current);
388 setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
390 struct aux_sigframe __user *aux;
393 __put_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err);
394 __put_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err);
395 __put_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err);
396 __put_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err);
397 __put_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err);
398 __put_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err);
399 __put_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err);
400 __put_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err);
401 __put_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err);
402 __put_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err);
403 __put_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err);
404 __put_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err);
405 __put_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err);
406 __put_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err);
407 __put_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err);
408 __put_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err);
409 __put_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err);
411 __put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, err);
412 __put_user_error(current->thread.error_code, &sf->uc.uc_mcontext.error_code, err);
413 __put_user_error(current->thread.address, &sf->uc.uc_mcontext.fault_address, err);
414 __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
416 err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
418 aux = (struct aux_sigframe __user *) sf->uc.uc_regspace;
421 err |= preserve_crunch_context(&aux->crunch);
424 if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
425 err |= preserve_iwmmxt_context(&aux->iwmmxt);
429 err |= preserve_vfp_context(&aux->vfp);
431 __put_user_error(0, &aux->end_magic, err);
436 static inline void __user *
437 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
439 unsigned long sp = regs->ARM_sp;
443 * This is the X/Open sanctioned signal stack switching.
445 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
446 sp = current->sas_ss_sp + current->sas_ss_size;
449 * ATPCS B01 mandates 8-byte alignment
451 frame = (void __user *)((sp - framesize) & ~7);
454 * Check that we can actually write to the signal frame.
456 if (!access_ok(VERIFY_WRITE, frame, framesize))
463 setup_return(struct pt_regs *regs, struct k_sigaction *ka,
464 unsigned long __user *rc, void __user *frame, int usig)
466 unsigned long handler = (unsigned long)ka->sa.sa_handler;
467 unsigned long retcode;
469 unsigned long cpsr = regs->ARM_cpsr & ~(PSR_f | PSR_E_BIT);
471 cpsr |= PSR_ENDSTATE;
474 * Maybe we need to deliver a 32-bit signal to a 26-bit task.
476 if (ka->sa.sa_flags & SA_THIRTYTWO)
477 cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
479 #ifdef CONFIG_ARM_THUMB
480 if (elf_hwcap & HWCAP_THUMB) {
482 * The LSB of the handler determines if we're going to
483 * be using THUMB or ARM mode for this signal handler.
489 #if __LINUX_ARM_ARCH__ >= 7
490 /* clear the If-Then Thumb-2 execution state */
491 cpsr &= ~PSR_IT_MASK;
498 if (ka->sa.sa_flags & SA_RESTORER) {
499 retcode = (unsigned long)ka->sa.sa_restorer;
501 unsigned int idx = thumb << 1;
503 if (ka->sa.sa_flags & SA_SIGINFO)
506 if (__put_user(sigreturn_codes[idx], rc) ||
507 __put_user(sigreturn_codes[idx+1], rc+1))
510 if (cpsr & MODE32_BIT) {
512 * 32-bit code can use the new high-page
513 * signal return code support.
515 retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb;
518 * Ensure that the instruction cache sees
519 * the return code written onto the stack.
521 flush_icache_range((unsigned long)rc,
522 (unsigned long)(rc + 2));
524 retcode = ((unsigned long)rc) + thumb;
529 regs->ARM_sp = (unsigned long)frame;
530 regs->ARM_lr = retcode;
531 regs->ARM_pc = handler;
532 regs->ARM_cpsr = cpsr;
538 setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs)
540 struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
547 * Set uc.uc_flags to a value which sc.trap_no would never have.
549 __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
551 err |= setup_sigframe(frame, regs, set);
553 err = setup_return(regs, ka, frame->retcode, frame, usig);
559 setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
560 sigset_t *set, struct pt_regs *regs)
562 struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
569 err |= copy_siginfo_to_user(&frame->info, info);
571 __put_user_error(0, &frame->sig.uc.uc_flags, err);
572 __put_user_error(NULL, &frame->sig.uc.uc_link, err);
574 memset(&stack, 0, sizeof(stack));
575 stack.ss_sp = (void __user *)current->sas_ss_sp;
576 stack.ss_flags = sas_ss_flags(regs->ARM_sp);
577 stack.ss_size = current->sas_ss_size;
578 err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
580 err |= setup_sigframe(&frame->sig, regs, set);
582 err = setup_return(regs, ka, frame->sig.retcode, frame, usig);
586 * For realtime signals we must also set the second and third
587 * arguments for the signal handler.
588 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
590 regs->ARM_r1 = (unsigned long)&frame->info;
591 regs->ARM_r2 = (unsigned long)&frame->sig.uc;
598 * OK, we're invoking a handler
601 handle_signal(unsigned long sig, struct k_sigaction *ka,
602 siginfo_t *info, sigset_t *oldset,
603 struct pt_regs * regs)
605 struct thread_info *thread = current_thread_info();
606 struct task_struct *tsk = current;
611 * translate the signal
613 if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
614 usig = thread->exec_domain->signal_invmap[usig];
617 * Set up the stack frame
619 if (ka->sa.sa_flags & SA_SIGINFO)
620 ret = setup_rt_frame(usig, ka, info, oldset, regs);
622 ret = setup_frame(usig, ka, oldset, regs);
625 * Check that the resulting registers are actually sane.
627 ret |= !valid_user_regs(regs);
630 force_sigsegv(sig, tsk);
635 * Block the signal if we were successful.
637 block_sigmask(ka, sig);
643 * Note that 'init' is a special process: it doesn't get signals it doesn't
644 * want to handle. Thus you cannot kill init even with a SIGKILL even by
647 * Note that we go through the signals twice: once to check the signals that
648 * the kernel can handle, and then we build all the user-level signal handling
649 * stack-frames in one go after that.
651 static void do_signal(struct pt_regs *regs, int syscall)
653 unsigned int retval = 0, continue_addr = 0, restart_addr = 0;
654 struct k_sigaction ka;
659 * We want the common case to go fast, which
660 * is why we may in certain cases get here from
661 * kernel mode. Just return without doing anything
664 if (!user_mode(regs))
668 * If we were from a system call, check for system call restarting...
671 continue_addr = regs->ARM_pc;
672 restart_addr = continue_addr - (thumb_mode(regs) ? 2 : 4);
673 retval = regs->ARM_r0;
676 * Prepare for system call restart. We do this here so that a
677 * debugger will see the already changed PSW.
680 case -ERESTARTNOHAND:
682 case -ERESTARTNOINTR:
683 regs->ARM_r0 = regs->ARM_ORIG_r0;
684 regs->ARM_pc = restart_addr;
686 case -ERESTART_RESTARTBLOCK:
687 regs->ARM_r0 = -EINTR;
696 * Get the signal to deliver. When running under ptrace, at this
697 * point the debugger may change all our registers ...
699 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
704 * Depending on the signal settings we may need to revert the
705 * decision to restart the system call. But skip this if a
706 * debugger has chosen to restart at a different PC.
708 if (regs->ARM_pc == restart_addr) {
709 if (retval == -ERESTARTNOHAND
710 || (retval == -ERESTARTSYS
711 && !(ka.sa.sa_flags & SA_RESTART))) {
712 regs->ARM_r0 = -EINTR;
713 regs->ARM_pc = continue_addr;
717 if (test_thread_flag(TIF_RESTORE_SIGMASK))
718 oldset = ¤t->saved_sigmask;
720 oldset = ¤t->blocked;
721 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
723 * A signal was successfully delivered; the saved
724 * sigmask will have been stored in the signal frame,
725 * and will be restored by sigreturn, so we can simply
726 * clear the TIF_RESTORE_SIGMASK flag.
728 if (test_thread_flag(TIF_RESTORE_SIGMASK))
729 clear_thread_flag(TIF_RESTORE_SIGMASK);
737 * Handle restarting a different system call. As above,
738 * if a debugger has chosen to restart at a different PC,
739 * ignore the restart.
741 if (retval == -ERESTART_RESTARTBLOCK
742 && regs->ARM_pc == continue_addr) {
743 if (thumb_mode(regs)) {
744 regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE;
747 #if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT)
748 regs->ARM_r7 = __NR_restart_syscall;
754 usp = (u32 __user *)regs->ARM_sp;
756 if (put_user(regs->ARM_pc, usp) == 0) {
757 regs->ARM_pc = KERN_RESTART_CODE;
760 force_sigsegv(0, current);
766 /* If there's no signal to deliver, we just put the saved sigmask
769 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
770 clear_thread_flag(TIF_RESTORE_SIGMASK);
771 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
777 do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
779 if (thread_flags & _TIF_SIGPENDING)
780 do_signal(regs, syscall);
782 if (thread_flags & _TIF_NOTIFY_RESUME) {
783 clear_thread_flag(TIF_NOTIFY_RESUME);
784 tracehook_notify_resume(regs);
785 if (current->replacement_session_keyring)
786 key_replace_session_keyring();