1 /* 2 * linux/arch/sh/kernel/signal.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * 6 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson 7 * 8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima 9 * 10 */ 11 #include <linux/sched.h> 12 #include <linux/mm.h> 13 #include <linux/smp.h> 14 #include <linux/kernel.h> 15 #include <linux/signal.h> 16 #include <linux/errno.h> 17 #include <linux/wait.h> 18 #include <linux/ptrace.h> 19 #include <linux/unistd.h> 20 #include <linux/stddef.h> 21 #include <linux/tty.h> 22 #include <linux/elf.h> 23 #include <linux/personality.h> 24 #include <linux/binfmts.h> 25 #include <linux/freezer.h> 26 #include <linux/io.h> 27 #include <linux/tracehook.h> 28 #include <asm/system.h> 29 #include <asm/ucontext.h> 30 #include <asm/uaccess.h> 31 #include <asm/pgtable.h> 32 #include <asm/cacheflush.h> 33 #include <asm/syscalls.h> 34 #include <asm/fpu.h> 35 36 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 37 38 struct fdpic_func_descriptor { 39 unsigned long text; 40 unsigned long GOT; 41 }; 42 43 /* 44 * The following define adds a 64 byte gap between the signal 45 * stack frame and previous contents of the stack. This allows 46 * frame unwinding in a function epilogue but only if a frame 47 * pointer is used in the function. This is necessary because 48 * current gcc compilers (<4.3) do not generate unwind info on 49 * SH for function epilogues. 50 */ 51 #define UNWINDGUARD 64 52 53 /* 54 * Atomically swap in the new signal mask, and wait for a signal. 55 */ 56 asmlinkage int 57 sys_sigsuspend(old_sigset_t mask, 58 unsigned long r5, unsigned long r6, unsigned long r7, 59 struct pt_regs __regs) 60 { 61 mask &= _BLOCKABLE; 62 spin_lock_irq(¤t->sighand->siglock); 63 current->saved_sigmask = current->blocked; 64 siginitset(¤t->blocked, mask); 65 recalc_sigpending(); 66 spin_unlock_irq(¤t->sighand->siglock); 67 68 current->state = TASK_INTERRUPTIBLE; 69 schedule(); 70 set_thread_flag(TIF_RESTORE_SIGMASK); 71 return -ERESTARTNOHAND; 72 } 73 74 asmlinkage int 75 sys_sigaction(int sig, const struct old_sigaction __user *act, 76 struct old_sigaction __user *oact) 77 { 78 struct k_sigaction new_ka, old_ka; 79 int ret; 80 81 if (act) { 82 old_sigset_t mask; 83 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 84 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 85 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) 86 return -EFAULT; 87 __get_user(new_ka.sa.sa_flags, &act->sa_flags); 88 __get_user(mask, &act->sa_mask); 89 siginitset(&new_ka.sa.sa_mask, mask); 90 } 91 92 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 93 94 if (!ret && oact) { 95 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 96 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 97 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) 98 return -EFAULT; 99 __put_user(old_ka.sa.sa_flags, &oact->sa_flags); 100 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); 101 } 102 103 return ret; 104 } 105 106 asmlinkage int 107 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, 108 unsigned long r6, unsigned long r7, 109 struct pt_regs __regs) 110 { 111 struct pt_regs *regs = RELOC_HIDE(&__regs, 0); 112 113 return do_sigaltstack(uss, uoss, regs->regs[15]); 114 } 115 116 117 /* 118 * Do a signal return; undo the signal stack. 119 */ 120 121 #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ 122 #if defined(CONFIG_CPU_SH2) 123 #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ 124 #else 125 #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ 126 #endif 127 #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ 128 129 struct sigframe 130 { 131 struct sigcontext sc; 132 unsigned long extramask[_NSIG_WORDS-1]; 133 u16 retcode[8]; 134 }; 135 136 struct rt_sigframe 137 { 138 struct siginfo info; 139 struct ucontext uc; 140 u16 retcode[8]; 141 }; 142 143 #ifdef CONFIG_SH_FPU 144 static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) 145 { 146 struct task_struct *tsk = current; 147 148 if (!(boot_cpu_data.flags & CPU_HAS_FPU)) 149 return 0; 150 151 set_used_math(); 152 return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0], 153 sizeof(long)*(16*2+2)); 154 } 155 156 static inline int save_sigcontext_fpu(struct sigcontext __user *sc, 157 struct pt_regs *regs) 158 { 159 struct task_struct *tsk = current; 160 161 if (!(boot_cpu_data.flags & CPU_HAS_FPU)) 162 return 0; 163 164 if (!used_math()) { 165 __put_user(0, &sc->sc_ownedfp); 166 return 0; 167 } 168 169 __put_user(1, &sc->sc_ownedfp); 170 171 /* This will cause a "finit" to be triggered by the next 172 attempted FPU operation by the 'current' process. 173 */ 174 clear_used_math(); 175 176 unlazy_fpu(tsk, regs); 177 return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard, 178 sizeof(long)*(16*2+2)); 179 } 180 #endif /* CONFIG_SH_FPU */ 181 182 static int 183 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) 184 { 185 unsigned int err = 0; 186 187 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) 188 COPY(regs[1]); 189 COPY(regs[2]); COPY(regs[3]); 190 COPY(regs[4]); COPY(regs[5]); 191 COPY(regs[6]); COPY(regs[7]); 192 COPY(regs[8]); COPY(regs[9]); 193 COPY(regs[10]); COPY(regs[11]); 194 COPY(regs[12]); COPY(regs[13]); 195 COPY(regs[14]); COPY(regs[15]); 196 COPY(gbr); COPY(mach); 197 COPY(macl); COPY(pr); 198 COPY(sr); COPY(pc); 199 #undef COPY 200 201 #ifdef CONFIG_SH_FPU 202 if (boot_cpu_data.flags & CPU_HAS_FPU) { 203 int owned_fp; 204 struct task_struct *tsk = current; 205 206 regs->sr |= SR_FD; /* Release FPU */ 207 clear_fpu(tsk, regs); 208 clear_used_math(); 209 __get_user (owned_fp, &sc->sc_ownedfp); 210 if (owned_fp) 211 err |= restore_sigcontext_fpu(sc); 212 } 213 #endif 214 215 regs->tra = -1; /* disable syscall checks */ 216 err |= __get_user(*r0_p, &sc->sc_regs[0]); 217 return err; 218 } 219 220 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, 221 unsigned long r6, unsigned long r7, 222 struct pt_regs __regs) 223 { 224 struct pt_regs *regs = RELOC_HIDE(&__regs, 0); 225 struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; 226 sigset_t set; 227 int r0; 228 229 /* Always make any pending restarted system calls return -EINTR */ 230 current_thread_info()->restart_block.fn = do_no_restart_syscall; 231 232 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 233 goto badframe; 234 235 if (__get_user(set.sig[0], &frame->sc.oldmask) 236 || (_NSIG_WORDS > 1 237 && __copy_from_user(&set.sig[1], &frame->extramask, 238 sizeof(frame->extramask)))) 239 goto badframe; 240 241 sigdelsetmask(&set, ~_BLOCKABLE); 242 243 spin_lock_irq(¤t->sighand->siglock); 244 current->blocked = set; 245 recalc_sigpending(); 246 spin_unlock_irq(¤t->sighand->siglock); 247 248 if (restore_sigcontext(regs, &frame->sc, &r0)) 249 goto badframe; 250 return r0; 251 252 badframe: 253 force_sig(SIGSEGV, current); 254 return 0; 255 } 256 257 asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, 258 unsigned long r6, unsigned long r7, 259 struct pt_regs __regs) 260 { 261 struct pt_regs *regs = RELOC_HIDE(&__regs, 0); 262 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; 263 sigset_t set; 264 int r0; 265 266 /* Always make any pending restarted system calls return -EINTR */ 267 current_thread_info()->restart_block.fn = do_no_restart_syscall; 268 269 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 270 goto badframe; 271 272 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 273 goto badframe; 274 275 sigdelsetmask(&set, ~_BLOCKABLE); 276 spin_lock_irq(¤t->sighand->siglock); 277 current->blocked = set; 278 recalc_sigpending(); 279 spin_unlock_irq(¤t->sighand->siglock); 280 281 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) 282 goto badframe; 283 284 if (do_sigaltstack(&frame->uc.uc_stack, NULL, 285 regs->regs[15]) == -EFAULT) 286 goto badframe; 287 288 return r0; 289 290 badframe: 291 force_sig(SIGSEGV, current); 292 return 0; 293 } 294 295 /* 296 * Set up a signal frame. 297 */ 298 299 static int 300 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, 301 unsigned long mask) 302 { 303 int err = 0; 304 305 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) 306 COPY(regs[0]); COPY(regs[1]); 307 COPY(regs[2]); COPY(regs[3]); 308 COPY(regs[4]); COPY(regs[5]); 309 COPY(regs[6]); COPY(regs[7]); 310 COPY(regs[8]); COPY(regs[9]); 311 COPY(regs[10]); COPY(regs[11]); 312 COPY(regs[12]); COPY(regs[13]); 313 COPY(regs[14]); COPY(regs[15]); 314 COPY(gbr); COPY(mach); 315 COPY(macl); COPY(pr); 316 COPY(sr); COPY(pc); 317 #undef COPY 318 319 #ifdef CONFIG_SH_FPU 320 err |= save_sigcontext_fpu(sc, regs); 321 #endif 322 323 /* non-iBCS2 extensions.. */ 324 err |= __put_user(mask, &sc->oldmask); 325 326 return err; 327 } 328 329 /* 330 * Determine which stack to use.. 331 */ 332 static inline void __user * 333 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) 334 { 335 if (ka->sa.sa_flags & SA_ONSTACK) { 336 if (sas_ss_flags(sp) == 0) 337 sp = current->sas_ss_sp + current->sas_ss_size; 338 } 339 340 return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul); 341 } 342 343 /* These symbols are defined with the addresses in the vsyscall page. 344 See vsyscall-trapa.S. */ 345 extern void __kernel_sigreturn(void); 346 extern void __kernel_rt_sigreturn(void); 347 348 static int setup_frame(int sig, struct k_sigaction *ka, 349 sigset_t *set, struct pt_regs *regs) 350 { 351 struct sigframe __user *frame; 352 int err = 0; 353 int signal; 354 355 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); 356 357 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) 358 goto give_sigsegv; 359 360 signal = current_thread_info()->exec_domain 361 && current_thread_info()->exec_domain->signal_invmap 362 && sig < 32 363 ? current_thread_info()->exec_domain->signal_invmap[sig] 364 : sig; 365 366 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); 367 368 if (_NSIG_WORDS > 1) 369 err |= __copy_to_user(frame->extramask, &set->sig[1], 370 sizeof(frame->extramask)); 371 372 /* Set up to return from userspace. If provided, use a stub 373 already in userspace. */ 374 if (ka->sa.sa_flags & SA_RESTORER) { 375 regs->pr = (unsigned long) ka->sa.sa_restorer; 376 #ifdef CONFIG_VSYSCALL 377 } else if (likely(current->mm->context.vdso)) { 378 regs->pr = VDSO_SYM(&__kernel_sigreturn); 379 #endif 380 } else { 381 /* Generate return code (system call to sigreturn) */ 382 err |= __put_user(MOVW(7), &frame->retcode[0]); 383 err |= __put_user(TRAP_NOARG, &frame->retcode[1]); 384 err |= __put_user(OR_R0_R0, &frame->retcode[2]); 385 err |= __put_user(OR_R0_R0, &frame->retcode[3]); 386 err |= __put_user(OR_R0_R0, &frame->retcode[4]); 387 err |= __put_user(OR_R0_R0, &frame->retcode[5]); 388 err |= __put_user(OR_R0_R0, &frame->retcode[6]); 389 err |= __put_user((__NR_sigreturn), &frame->retcode[7]); 390 regs->pr = (unsigned long) frame->retcode; 391 flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); 392 } 393 394 if (err) 395 goto give_sigsegv; 396 397 /* Set up registers for signal handler */ 398 regs->regs[15] = (unsigned long) frame; 399 regs->regs[4] = signal; /* Arg for signal handler */ 400 regs->regs[5] = 0; 401 regs->regs[6] = (unsigned long) &frame->sc; 402 403 if (current->personality & FDPIC_FUNCPTRS) { 404 struct fdpic_func_descriptor __user *funcptr = 405 (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; 406 407 __get_user(regs->pc, &funcptr->text); 408 __get_user(regs->regs[12], &funcptr->GOT); 409 } else 410 regs->pc = (unsigned long)ka->sa.sa_handler; 411 412 set_fs(USER_DS); 413 414 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", 415 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); 416 417 return 0; 418 419 give_sigsegv: 420 force_sigsegv(sig, current); 421 return -EFAULT; 422 } 423 424 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, 425 sigset_t *set, struct pt_regs *regs) 426 { 427 struct rt_sigframe __user *frame; 428 int err = 0; 429 int signal; 430 431 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); 432 433 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) 434 goto give_sigsegv; 435 436 signal = current_thread_info()->exec_domain 437 && current_thread_info()->exec_domain->signal_invmap 438 && sig < 32 439 ? current_thread_info()->exec_domain->signal_invmap[sig] 440 : sig; 441 442 err |= copy_siginfo_to_user(&frame->info, info); 443 444 /* Create the ucontext. */ 445 err |= __put_user(0, &frame->uc.uc_flags); 446 err |= __put_user(NULL, &frame->uc.uc_link); 447 err |= __put_user((void *)current->sas_ss_sp, 448 &frame->uc.uc_stack.ss_sp); 449 err |= __put_user(sas_ss_flags(regs->regs[15]), 450 &frame->uc.uc_stack.ss_flags); 451 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); 452 err |= setup_sigcontext(&frame->uc.uc_mcontext, 453 regs, set->sig[0]); 454 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); 455 456 /* Set up to return from userspace. If provided, use a stub 457 already in userspace. */ 458 if (ka->sa.sa_flags & SA_RESTORER) { 459 regs->pr = (unsigned long) ka->sa.sa_restorer; 460 #ifdef CONFIG_VSYSCALL 461 } else if (likely(current->mm->context.vdso)) { 462 regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); 463 #endif 464 } else { 465 /* Generate return code (system call to rt_sigreturn) */ 466 err |= __put_user(MOVW(7), &frame->retcode[0]); 467 err |= __put_user(TRAP_NOARG, &frame->retcode[1]); 468 err |= __put_user(OR_R0_R0, &frame->retcode[2]); 469 err |= __put_user(OR_R0_R0, &frame->retcode[3]); 470 err |= __put_user(OR_R0_R0, &frame->retcode[4]); 471 err |= __put_user(OR_R0_R0, &frame->retcode[5]); 472 err |= __put_user(OR_R0_R0, &frame->retcode[6]); 473 err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); 474 regs->pr = (unsigned long) frame->retcode; 475 flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); 476 } 477 478 if (err) 479 goto give_sigsegv; 480 481 /* Set up registers for signal handler */ 482 regs->regs[15] = (unsigned long) frame; 483 regs->regs[4] = signal; /* Arg for signal handler */ 484 regs->regs[5] = (unsigned long) &frame->info; 485 regs->regs[6] = (unsigned long) &frame->uc; 486 487 if (current->personality & FDPIC_FUNCPTRS) { 488 struct fdpic_func_descriptor __user *funcptr = 489 (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; 490 491 __get_user(regs->pc, &funcptr->text); 492 __get_user(regs->regs[12], &funcptr->GOT); 493 } else 494 regs->pc = (unsigned long)ka->sa.sa_handler; 495 496 set_fs(USER_DS); 497 498 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", 499 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); 500 501 return 0; 502 503 give_sigsegv: 504 force_sigsegv(sig, current); 505 return -EFAULT; 506 } 507 508 static inline void 509 handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs, 510 struct sigaction *sa) 511 { 512 /* If we're not from a syscall, bail out */ 513 if (regs->tra < 0) 514 return; 515 516 /* check for system call restart.. */ 517 switch (regs->regs[0]) { 518 case -ERESTART_RESTARTBLOCK: 519 case -ERESTARTNOHAND: 520 no_system_call_restart: 521 regs->regs[0] = -EINTR; 522 break; 523 524 case -ERESTARTSYS: 525 if (!(sa->sa_flags & SA_RESTART)) 526 goto no_system_call_restart; 527 /* fallthrough */ 528 case -ERESTARTNOINTR: 529 regs->regs[0] = save_r0; 530 regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); 531 break; 532 } 533 } 534 535 /* 536 * OK, we're invoking a handler 537 */ 538 static int 539 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, 540 sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0) 541 { 542 int ret; 543 544 /* Set up the stack frame */ 545 if (ka->sa.sa_flags & SA_SIGINFO) 546 ret = setup_rt_frame(sig, ka, info, oldset, regs); 547 else 548 ret = setup_frame(sig, ka, oldset, regs); 549 550 if (ka->sa.sa_flags & SA_ONESHOT) 551 ka->sa.sa_handler = SIG_DFL; 552 553 if (ret == 0) { 554 spin_lock_irq(¤t->sighand->siglock); 555 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); 556 if (!(ka->sa.sa_flags & SA_NODEFER)) 557 sigaddset(¤t->blocked,sig); 558 recalc_sigpending(); 559 spin_unlock_irq(¤t->sighand->siglock); 560 } 561 562 return ret; 563 } 564 565 /* 566 * Note that 'init' is a special process: it doesn't get signals it doesn't 567 * want to handle. Thus you cannot kill init even with a SIGKILL even by 568 * mistake. 569 * 570 * Note that we go through the signals twice: once to check the signals that 571 * the kernel can handle, and then we build all the user-level signal handling 572 * stack-frames in one go after that. 573 */ 574 static void do_signal(struct pt_regs *regs, unsigned int save_r0) 575 { 576 siginfo_t info; 577 int signr; 578 struct k_sigaction ka; 579 sigset_t *oldset; 580 581 /* 582 * We want the common case to go fast, which 583 * is why we may in certain cases get here from 584 * kernel mode. Just return without doing anything 585 * if so. 586 */ 587 if (!user_mode(regs)) 588 return; 589 590 if (try_to_freeze()) 591 goto no_signal; 592 593 if (test_thread_flag(TIF_RESTORE_SIGMASK)) 594 oldset = ¤t->saved_sigmask; 595 else 596 oldset = ¤t->blocked; 597 598 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 599 if (signr > 0) { 600 handle_syscall_restart(save_r0, regs, &ka.sa); 601 602 /* Whee! Actually deliver the signal. */ 603 if (handle_signal(signr, &ka, &info, oldset, 604 regs, save_r0) == 0) { 605 /* a signal was successfully delivered; the saved 606 * sigmask will have been stored in the signal frame, 607 * and will be restored by sigreturn, so we can simply 608 * clear the TIF_RESTORE_SIGMASK flag */ 609 if (test_thread_flag(TIF_RESTORE_SIGMASK)) 610 clear_thread_flag(TIF_RESTORE_SIGMASK); 611 612 tracehook_signal_handler(signr, &info, &ka, regs, 613 test_thread_flag(TIF_SINGLESTEP)); 614 } 615 616 return; 617 } 618 619 no_signal: 620 /* Did we come from a system call? */ 621 if (regs->tra >= 0) { 622 /* Restart the system call - no handlers present */ 623 if (regs->regs[0] == -ERESTARTNOHAND || 624 regs->regs[0] == -ERESTARTSYS || 625 regs->regs[0] == -ERESTARTNOINTR) { 626 regs->regs[0] = save_r0; 627 regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); 628 } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { 629 regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); 630 regs->regs[3] = __NR_restart_syscall; 631 } 632 } 633 634 /* if there's no signal to deliver, we just put the saved sigmask 635 * back */ 636 if (test_thread_flag(TIF_RESTORE_SIGMASK)) { 637 clear_thread_flag(TIF_RESTORE_SIGMASK); 638 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); 639 } 640 } 641 642 asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0, 643 unsigned long thread_info_flags) 644 { 645 /* deal with pending signal delivery */ 646 if (thread_info_flags & _TIF_SIGPENDING) 647 do_signal(regs, save_r0); 648 649 if (thread_info_flags & _TIF_NOTIFY_RESUME) { 650 clear_thread_flag(TIF_NOTIFY_RESUME); 651 tracehook_notify_resume(regs); 652 if (current->replacement_session_keyring) 653 key_replace_session_keyring(); 654 } 655 } 656