1 /* 2 * linux/arch/parisc/kernel/signal.c: Architecture-specific signal 3 * handling support. 4 * 5 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> 6 * Copyright (C) 2000 Linuxcare, Inc. 7 * 8 * Based on the ia64, i386, and alpha versions. 9 * 10 * Like the IA-64, we are a recent enough port (we are *starting* 11 * with glibc2.2) that we do not need to support the old non-realtime 12 * Linux signals. Therefore we don't. HP/UX signals will go in 13 * arch/parisc/hpux/signal.c when we figure out how to do them. 14 */ 15 16 #include <linux/sched.h> 17 #include <linux/mm.h> 18 #include <linux/smp.h> 19 #include <linux/kernel.h> 20 #include <linux/signal.h> 21 #include <linux/errno.h> 22 #include <linux/wait.h> 23 #include <linux/ptrace.h> 24 #include <linux/tracehook.h> 25 #include <linux/unistd.h> 26 #include <linux/stddef.h> 27 #include <linux/compat.h> 28 #include <linux/elf.h> 29 #include <asm/ucontext.h> 30 #include <asm/rt_sigframe.h> 31 #include <asm/uaccess.h> 32 #include <asm/pgalloc.h> 33 #include <asm/cacheflush.h> 34 #include <asm/asm-offsets.h> 35 36 #ifdef CONFIG_COMPAT 37 #include "signal32.h" 38 #endif 39 40 #define DEBUG_SIG 0 41 #define DEBUG_SIG_LEVEL 2 42 43 #if DEBUG_SIG 44 #define DBG(LEVEL, ...) \ 45 ((DEBUG_SIG_LEVEL >= LEVEL) \ 46 ? printk(__VA_ARGS__) : (void) 0) 47 #else 48 #define DBG(LEVEL, ...) 49 #endif 50 51 /* gcc will complain if a pointer is cast to an integer of different 52 * size. If you really need to do this (and we do for an ELF32 user 53 * application in an ELF64 kernel) then you have to do a cast to an 54 * integer of the same size first. The A() macro accomplishes 55 * this. */ 56 #define A(__x) ((unsigned long)(__x)) 57 58 /* 59 * Atomically swap in the new signal mask, and wait for a signal. 60 */ 61 #ifdef CONFIG_64BIT 62 #include "sys32.h" 63 #endif 64 65 /* 66 * Do a signal return - restore sigcontext. 67 */ 68 69 /* Trampoline for calling rt_sigreturn() */ 70 #define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */ 71 #define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */ 72 #define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */ 73 #define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */ 74 #define INSN_NOP 0x08000240 /* nop */ 75 /* For debugging */ 76 #define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */ 77 78 static long 79 restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs) 80 { 81 long err = 0; 82 83 err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr)); 84 err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); 85 err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq)); 86 err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq)); 87 err |= __get_user(regs->sar, &sc->sc_sar); 88 DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n", 89 regs->iaoq[0],regs->iaoq[1]); 90 DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]); 91 return err; 92 } 93 94 void 95 sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) 96 { 97 struct rt_sigframe __user *frame; 98 sigset_t set; 99 unsigned long usp = (regs->gr[30] & ~(0x01UL)); 100 unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; 101 #ifdef CONFIG_64BIT 102 compat_sigset_t compat_set; 103 struct compat_rt_sigframe __user * compat_frame; 104 105 if (is_compat_task()) 106 sigframe_size = PARISC_RT_SIGFRAME_SIZE32; 107 #endif 108 109 current_thread_info()->restart_block.fn = do_no_restart_syscall; 110 111 /* Unwind the user stack to get the rt_sigframe structure. */ 112 frame = (struct rt_sigframe __user *) 113 (usp - sigframe_size); 114 DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); 115 116 regs->orig_r28 = 1; /* no restarts for sigreturn */ 117 118 #ifdef CONFIG_64BIT 119 compat_frame = (struct compat_rt_sigframe __user *)frame; 120 121 if (is_compat_task()) { 122 DBG(2,"sys_rt_sigreturn: ELF32 process.\n"); 123 if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set))) 124 goto give_sigsegv; 125 sigset_32to64(&set,&compat_set); 126 } else 127 #endif 128 { 129 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 130 goto give_sigsegv; 131 } 132 133 set_current_blocked(&set); 134 135 /* Good thing we saved the old gr[30], eh? */ 136 #ifdef CONFIG_64BIT 137 if (is_compat_task()) { 138 DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", 139 &compat_frame->uc.uc_mcontext); 140 // FIXME: Load upper half from register file 141 if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, 142 &compat_frame->regs, regs)) 143 goto give_sigsegv; 144 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", 145 usp, &compat_frame->uc.uc_stack); 146 if (compat_restore_altstack(&compat_frame->uc.uc_stack)) 147 goto give_sigsegv; 148 } else 149 #endif 150 { 151 DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n", 152 &frame->uc.uc_mcontext); 153 if (restore_sigcontext(&frame->uc.uc_mcontext, regs)) 154 goto give_sigsegv; 155 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", 156 usp, &frame->uc.uc_stack); 157 if (restore_altstack(&frame->uc.uc_stack)) 158 goto give_sigsegv; 159 } 160 161 162 163 /* If we are on the syscall path IAOQ will not be restored, and 164 * if we are on the interrupt path we must not corrupt gr31. 165 */ 166 if (in_syscall) 167 regs->gr[31] = regs->iaoq[0]; 168 #if DEBUG_SIG 169 DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]); 170 show_regs(regs); 171 #endif 172 return; 173 174 give_sigsegv: 175 DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n"); 176 force_sig(SIGSEGV, current); 177 return; 178 } 179 180 /* 181 * Set up a signal frame. 182 */ 183 184 static inline void __user * 185 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) 186 { 187 /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we 188 don't use the parameter it doesn't matter */ 189 190 DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n", 191 (unsigned long)ka, sp, frame_size); 192 193 /* Align alternate stack and reserve 64 bytes for the signal 194 handler's frame marker. */ 195 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) 196 sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */ 197 198 DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp); 199 return (void __user *) sp; /* Stacks grow up. Fun. */ 200 } 201 202 static long 203 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall) 204 205 { 206 unsigned long flags = 0; 207 long err = 0; 208 209 if (on_sig_stack((unsigned long) sc)) 210 flags |= PARISC_SC_FLAG_ONSTACK; 211 if (in_syscall) { 212 flags |= PARISC_SC_FLAG_IN_SYSCALL; 213 /* regs->iaoq is undefined in the syscall return path */ 214 err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]); 215 err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]); 216 err |= __put_user(regs->sr[3], &sc->sc_iasq[0]); 217 err |= __put_user(regs->sr[3], &sc->sc_iasq[1]); 218 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n", 219 regs->gr[31], regs->gr[31]+4); 220 } else { 221 err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq)); 222 err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq)); 223 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", 224 regs->iaoq[0], regs->iaoq[1]); 225 } 226 227 err |= __put_user(flags, &sc->sc_flags); 228 err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr)); 229 err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); 230 err |= __put_user(regs->sar, &sc->sc_sar); 231 DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]); 232 233 return err; 234 } 235 236 static long 237 setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, 238 sigset_t *set, struct pt_regs *regs, int in_syscall) 239 { 240 struct rt_sigframe __user *frame; 241 unsigned long rp, usp; 242 unsigned long haddr, sigframe_size; 243 int err = 0; 244 #ifdef CONFIG_64BIT 245 struct compat_rt_sigframe __user * compat_frame; 246 compat_sigset_t compat_set; 247 #endif 248 249 usp = (regs->gr[30] & ~(0x01UL)); 250 /*FIXME: frame_size parameter is unused, remove it. */ 251 frame = get_sigframe(ka, usp, sizeof(*frame)); 252 253 DBG(1,"SETUP_RT_FRAME: START\n"); 254 DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info); 255 256 257 #ifdef CONFIG_64BIT 258 259 compat_frame = (struct compat_rt_sigframe __user *)frame; 260 261 if (is_compat_task()) { 262 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info); 263 err |= copy_siginfo_to_user32(&compat_frame->info, info); 264 err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]); 265 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc); 266 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext); 267 err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, 268 &compat_frame->regs, regs, in_syscall); 269 sigset_64to32(&compat_set,set); 270 err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set)); 271 } else 272 #endif 273 { 274 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info); 275 err |= copy_siginfo_to_user(&frame->info, info); 276 err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]); 277 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc); 278 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext); 279 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall); 280 /* FIXME: Should probably be converted as well for the compat case */ 281 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); 282 } 283 284 if (err) 285 goto give_sigsegv; 286 287 /* Set up to return from userspace. If provided, use a stub 288 already in userspace. The first words of tramp are used to 289 save the previous sigrestartblock trampoline that might be 290 on the stack. We start the sigreturn trampoline at 291 SIGRESTARTBLOCK_TRAMP+X. */ 292 err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0, 293 &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]); 294 err |= __put_user(INSN_LDI_R20, 295 &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]); 296 err |= __put_user(INSN_BLE_SR2_R0, 297 &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]); 298 err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]); 299 300 #if DEBUG_SIG 301 /* Assert that we're flushing in the correct space... */ 302 { 303 unsigned long sid; 304 asm ("mfsp %%sr3,%0" : "=r" (sid)); 305 DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n", 306 sid, frame->tramp); 307 } 308 #endif 309 310 flush_user_dcache_range((unsigned long) &frame->tramp[0], 311 (unsigned long) &frame->tramp[TRAMP_SIZE]); 312 flush_user_icache_range((unsigned long) &frame->tramp[0], 313 (unsigned long) &frame->tramp[TRAMP_SIZE]); 314 315 /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP 316 * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP 317 * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP 318 */ 319 rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP]; 320 321 if (err) 322 goto give_sigsegv; 323 324 haddr = A(ka->sa.sa_handler); 325 /* The sa_handler may be a pointer to a function descriptor */ 326 #ifdef CONFIG_64BIT 327 if (is_compat_task()) { 328 #endif 329 if (haddr & PA_PLABEL_FDESC) { 330 Elf32_Fdesc fdesc; 331 Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3); 332 333 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); 334 335 if (err) 336 goto give_sigsegv; 337 338 haddr = fdesc.addr; 339 regs->gr[19] = fdesc.gp; 340 } 341 #ifdef CONFIG_64BIT 342 } else { 343 Elf64_Fdesc fdesc; 344 Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); 345 346 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); 347 348 if (err) 349 goto give_sigsegv; 350 351 haddr = fdesc.addr; 352 regs->gr[19] = fdesc.gp; 353 DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n", 354 haddr, regs->gr[19], in_syscall); 355 } 356 #endif 357 358 /* The syscall return path will create IAOQ values from r31. 359 */ 360 sigframe_size = PARISC_RT_SIGFRAME_SIZE; 361 #ifdef CONFIG_64BIT 362 if (is_compat_task()) 363 sigframe_size = PARISC_RT_SIGFRAME_SIZE32; 364 #endif 365 if (in_syscall) { 366 regs->gr[31] = haddr; 367 #ifdef CONFIG_64BIT 368 if (!test_thread_flag(TIF_32BIT)) 369 sigframe_size |= 1; 370 #endif 371 } else { 372 unsigned long psw = USER_PSW; 373 #ifdef CONFIG_64BIT 374 if (!test_thread_flag(TIF_32BIT)) 375 psw |= PSW_W; 376 #endif 377 378 /* If we are singlestepping, arrange a trap to be delivered 379 when we return to userspace. Note the semantics -- we 380 should trap before the first insn in the handler is 381 executed. Ref: 382 http://sources.redhat.com/ml/gdb/2004-11/msg00245.html 383 */ 384 if (pa_psw(current)->r) { 385 pa_psw(current)->r = 0; 386 psw |= PSW_R; 387 mtctl(-1, 0); 388 } 389 390 regs->gr[0] = psw; 391 regs->iaoq[0] = haddr | 3; 392 regs->iaoq[1] = regs->iaoq[0] + 4; 393 } 394 395 regs->gr[2] = rp; /* userland return pointer */ 396 regs->gr[26] = sig; /* signal number */ 397 398 #ifdef CONFIG_64BIT 399 if (is_compat_task()) { 400 regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ 401 regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ 402 } else 403 #endif 404 { 405 regs->gr[25] = A(&frame->info); /* siginfo pointer */ 406 regs->gr[24] = A(&frame->uc); /* ucontext pointer */ 407 } 408 409 DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n", 410 regs->gr[30], sigframe_size, 411 regs->gr[30] + sigframe_size); 412 /* Raise the user stack pointer to make a proper call frame. */ 413 regs->gr[30] = (A(frame) + sigframe_size); 414 415 416 DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n", 417 current->comm, current->pid, frame, regs->gr[30], 418 regs->iaoq[0], regs->iaoq[1], rp); 419 420 return 1; 421 422 give_sigsegv: 423 DBG(1,"setup_rt_frame: sending SIGSEGV\n"); 424 force_sigsegv(sig, current); 425 return 0; 426 } 427 428 /* 429 * OK, we're invoking a handler. 430 */ 431 432 static void 433 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, 434 struct pt_regs *regs, int in_syscall) 435 { 436 sigset_t *oldset = sigmask_to_save(); 437 DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n", 438 sig, ka, info, oldset, regs); 439 440 /* Set up the stack frame */ 441 if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall)) 442 return; 443 444 signal_delivered(sig, info, ka, regs, 445 test_thread_flag(TIF_SINGLESTEP) || 446 test_thread_flag(TIF_BLOCKSTEP)); 447 448 DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", 449 regs->gr[28]); 450 } 451 452 static inline void 453 syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) 454 { 455 if (regs->orig_r28) 456 return; 457 regs->orig_r28 = 1; /* no more restarts */ 458 /* Check the return code */ 459 switch (regs->gr[28]) { 460 case -ERESTART_RESTARTBLOCK: 461 case -ERESTARTNOHAND: 462 DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); 463 regs->gr[28] = -EINTR; 464 break; 465 466 case -ERESTARTSYS: 467 if (!(ka->sa.sa_flags & SA_RESTART)) { 468 DBG(1,"ERESTARTSYS: putting -EINTR\n"); 469 regs->gr[28] = -EINTR; 470 break; 471 } 472 /* fallthrough */ 473 case -ERESTARTNOINTR: 474 /* A syscall is just a branch, so all 475 * we have to do is fiddle the return pointer. 476 */ 477 regs->gr[31] -= 8; /* delayed branching */ 478 break; 479 } 480 } 481 482 static inline void 483 insert_restart_trampoline(struct pt_regs *regs) 484 { 485 if (regs->orig_r28) 486 return; 487 regs->orig_r28 = 1; /* no more restarts */ 488 switch(regs->gr[28]) { 489 case -ERESTART_RESTARTBLOCK: { 490 /* Restart the system call - no handlers present */ 491 unsigned int *usp = (unsigned int *)regs->gr[30]; 492 493 /* Setup a trampoline to restart the syscall 494 * with __NR_restart_syscall 495 * 496 * 0: <return address (orig r31)> 497 * 4: <2nd half for 64-bit> 498 * 8: ldw 0(%sp), %r31 499 * 12: be 0x100(%sr2, %r0) 500 * 16: ldi __NR_restart_syscall, %r20 501 */ 502 #ifdef CONFIG_64BIT 503 put_user(regs->gr[31] >> 32, &usp[0]); 504 put_user(regs->gr[31] & 0xffffffff, &usp[1]); 505 put_user(0x0fc010df, &usp[2]); 506 #else 507 put_user(regs->gr[31], &usp[0]); 508 put_user(0x0fc0109f, &usp[2]); 509 #endif 510 put_user(0xe0008200, &usp[3]); 511 put_user(0x34140000, &usp[4]); 512 513 /* Stack is 64-byte aligned, and we only need 514 * to flush 1 cache line. 515 * Flushing one cacheline is cheap. 516 * "sync" on bigger (> 4 way) boxes is not. 517 */ 518 flush_user_dcache_range(regs->gr[30], regs->gr[30] + 4); 519 flush_user_icache_range(regs->gr[30], regs->gr[30] + 4); 520 521 regs->gr[31] = regs->gr[30] + 8; 522 return; 523 } 524 case -ERESTARTNOHAND: 525 case -ERESTARTSYS: 526 case -ERESTARTNOINTR: { 527 /* Hooray for delayed branching. We don't 528 * have to restore %r20 (the system call 529 * number) because it gets loaded in the delay 530 * slot of the branch external instruction. 531 */ 532 regs->gr[31] -= 8; 533 return; 534 } 535 default: 536 break; 537 } 538 } 539 540 /* 541 * Note that 'init' is a special process: it doesn't get signals it doesn't 542 * want to handle. Thus you cannot kill init even with a SIGKILL even by 543 * mistake. 544 * 545 * We need to be able to restore the syscall arguments (r21-r26) to 546 * restart syscalls. Thus, the syscall path should save them in the 547 * pt_regs structure (it's okay to do so since they are caller-save 548 * registers). As noted below, the syscall number gets restored for 549 * us due to the magic of delayed branching. 550 */ 551 asmlinkage void 552 do_signal(struct pt_regs *regs, long in_syscall) 553 { 554 siginfo_t info; 555 struct k_sigaction ka; 556 int signr; 557 558 DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n", 559 regs, regs->sr[7], in_syscall); 560 561 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 562 DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); 563 564 if (signr > 0) { 565 /* Restart a system call if necessary. */ 566 if (in_syscall) 567 syscall_restart(regs, &ka); 568 569 handle_signal(signr, &info, &ka, regs, in_syscall); 570 return; 571 } 572 573 /* Did we come from a system call? */ 574 if (in_syscall) 575 insert_restart_trampoline(regs); 576 577 DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", 578 regs->gr[28]); 579 580 restore_saved_sigmask(); 581 } 582 583 void do_notify_resume(struct pt_regs *regs, long in_syscall) 584 { 585 if (test_thread_flag(TIF_SIGPENDING)) 586 do_signal(regs, in_syscall); 587 588 if (test_thread_flag(TIF_NOTIFY_RESUME)) { 589 clear_thread_flag(TIF_NOTIFY_RESUME); 590 tracehook_notify_resume(regs); 591 } 592 } 593