1 /* 2 * arch/sparc64/kernel/signal.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) 6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) 7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) 8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 */ 10 11 #ifdef CONFIG_COMPAT 12 #include <linux/compat.h> /* for compat_old_sigset_t */ 13 #endif 14 #include <linux/sched.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/tracehook.h> 21 #include <linux/unistd.h> 22 #include <linux/mm.h> 23 #include <linux/tty.h> 24 #include <linux/binfmts.h> 25 #include <linux/bitops.h> 26 27 #include <asm/uaccess.h> 28 #include <asm/ptrace.h> 29 #include <asm/pgtable.h> 30 #include <asm/fpumacro.h> 31 #include <asm/uctx.h> 32 #include <asm/siginfo.h> 33 #include <asm/visasm.h> 34 #include <asm/switch_to.h> 35 #include <asm/cacheflush.h> 36 37 #include "entry.h" 38 #include "systbls.h" 39 #include "sigutil.h" 40 41 /* {set, get}context() needed for 64-bit SparcLinux userland. */ 42 asmlinkage void sparc64_set_context(struct pt_regs *regs) 43 { 44 struct ucontext __user *ucp = (struct ucontext __user *) 45 regs->u_regs[UREG_I0]; 46 mc_gregset_t __user *grp; 47 unsigned long pc, npc, tstate; 48 unsigned long fp, i7; 49 unsigned char fenab; 50 int err; 51 52 flush_user_windows(); 53 if (get_thread_wsaved() || 54 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || 55 (!__access_ok(ucp, sizeof(*ucp)))) 56 goto do_sigsegv; 57 grp = &ucp->uc_mcontext.mc_gregs; 58 err = __get_user(pc, &((*grp)[MC_PC])); 59 err |= __get_user(npc, &((*grp)[MC_NPC])); 60 if (err || ((pc | npc) & 3)) 61 goto do_sigsegv; 62 if (regs->u_regs[UREG_I1]) { 63 sigset_t set; 64 65 if (_NSIG_WORDS == 1) { 66 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) 67 goto do_sigsegv; 68 } else { 69 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) 70 goto do_sigsegv; 71 } 72 set_current_blocked(&set); 73 } 74 if (test_thread_flag(TIF_32BIT)) { 75 pc &= 0xffffffff; 76 npc &= 0xffffffff; 77 } 78 regs->tpc = pc; 79 regs->tnpc = npc; 80 err |= __get_user(regs->y, &((*grp)[MC_Y])); 81 err |= __get_user(tstate, &((*grp)[MC_TSTATE])); 82 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); 83 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); 84 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); 85 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); 86 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); 87 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); 88 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); 89 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); 90 91 /* Skip %g7 as that's the thread register in userspace. */ 92 93 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); 94 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); 95 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); 96 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); 97 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); 98 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); 99 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); 100 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); 101 102 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); 103 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); 104 err |= __put_user(fp, 105 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); 106 err |= __put_user(i7, 107 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); 108 109 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); 110 if (fenab) { 111 unsigned long *fpregs = current_thread_info()->fpregs; 112 unsigned long fprs; 113 114 fprs_write(0); 115 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); 116 if (fprs & FPRS_DL) 117 err |= copy_from_user(fpregs, 118 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), 119 (sizeof(unsigned int) * 32)); 120 if (fprs & FPRS_DU) 121 err |= copy_from_user(fpregs+16, 122 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, 123 (sizeof(unsigned int) * 32)); 124 err |= __get_user(current_thread_info()->xfsr[0], 125 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); 126 err |= __get_user(current_thread_info()->gsr[0], 127 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); 128 regs->tstate &= ~TSTATE_PEF; 129 } 130 if (err) 131 goto do_sigsegv; 132 133 return; 134 do_sigsegv: 135 force_sig(SIGSEGV, current); 136 } 137 138 asmlinkage void sparc64_get_context(struct pt_regs *regs) 139 { 140 struct ucontext __user *ucp = (struct ucontext __user *) 141 regs->u_regs[UREG_I0]; 142 mc_gregset_t __user *grp; 143 mcontext_t __user *mcp; 144 unsigned long fp, i7; 145 unsigned char fenab; 146 int err; 147 148 synchronize_user_stack(); 149 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) 150 goto do_sigsegv; 151 152 #if 1 153 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ 154 #else 155 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); 156 #endif 157 158 mcp = &ucp->uc_mcontext; 159 grp = &mcp->mc_gregs; 160 161 /* Skip over the trap instruction, first. */ 162 if (test_thread_flag(TIF_32BIT)) { 163 regs->tpc = (regs->tnpc & 0xffffffff); 164 regs->tnpc = (regs->tnpc + 4) & 0xffffffff; 165 } else { 166 regs->tpc = regs->tnpc; 167 regs->tnpc += 4; 168 } 169 err = 0; 170 if (_NSIG_WORDS == 1) 171 err |= __put_user(current->blocked.sig[0], 172 (unsigned long __user *)&ucp->uc_sigmask); 173 else 174 err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, 175 sizeof(sigset_t)); 176 177 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); 178 err |= __put_user(regs->tpc, &((*grp)[MC_PC])); 179 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); 180 err |= __put_user(regs->y, &((*grp)[MC_Y])); 181 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); 182 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); 183 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); 184 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); 185 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); 186 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); 187 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); 188 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); 189 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); 190 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); 191 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); 192 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); 193 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); 194 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); 195 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); 196 197 err |= __get_user(fp, 198 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); 199 err |= __get_user(i7, 200 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); 201 err |= __put_user(fp, &(mcp->mc_fp)); 202 err |= __put_user(i7, &(mcp->mc_i7)); 203 204 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); 205 if (fenab) { 206 unsigned long *fpregs = current_thread_info()->fpregs; 207 unsigned long fprs; 208 209 fprs = current_thread_info()->fpsaved[0]; 210 if (fprs & FPRS_DL) 211 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, 212 (sizeof(unsigned int) * 32)); 213 if (fprs & FPRS_DU) 214 err |= copy_to_user( 215 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, 216 (sizeof(unsigned int) * 32)); 217 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); 218 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); 219 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); 220 } 221 if (err) 222 goto do_sigsegv; 223 224 return; 225 do_sigsegv: 226 force_sig(SIGSEGV, current); 227 } 228 229 struct rt_signal_frame { 230 struct sparc_stackf ss; 231 siginfo_t info; 232 struct pt_regs regs; 233 __siginfo_fpu_t __user *fpu_save; 234 stack_t stack; 235 sigset_t mask; 236 __siginfo_rwin_t *rwin_save; 237 }; 238 239 static long _sigpause_common(old_sigset_t set) 240 { 241 sigset_t blocked; 242 siginitset(&blocked, set); 243 return sigsuspend(&blocked); 244 } 245 246 asmlinkage long sys_sigpause(unsigned int set) 247 { 248 return _sigpause_common(set); 249 } 250 251 asmlinkage long sys_sigsuspend(old_sigset_t set) 252 { 253 return _sigpause_common(set); 254 } 255 256 void do_rt_sigreturn(struct pt_regs *regs) 257 { 258 struct rt_signal_frame __user *sf; 259 unsigned long tpc, tnpc, tstate; 260 __siginfo_fpu_t __user *fpu_save; 261 __siginfo_rwin_t __user *rwin_save; 262 sigset_t set; 263 int err; 264 265 /* Always make any pending restarted system calls return -EINTR */ 266 current_thread_info()->restart_block.fn = do_no_restart_syscall; 267 268 synchronize_user_stack (); 269 sf = (struct rt_signal_frame __user *) 270 (regs->u_regs [UREG_FP] + STACK_BIAS); 271 272 /* 1. Make sure we are not getting garbage from the user */ 273 if (((unsigned long) sf) & 3) 274 goto segv; 275 276 err = get_user(tpc, &sf->regs.tpc); 277 err |= __get_user(tnpc, &sf->regs.tnpc); 278 if (test_thread_flag(TIF_32BIT)) { 279 tpc &= 0xffffffff; 280 tnpc &= 0xffffffff; 281 } 282 err |= ((tpc | tnpc) & 3); 283 284 /* 2. Restore the state */ 285 err |= __get_user(regs->y, &sf->regs.y); 286 err |= __get_user(tstate, &sf->regs.tstate); 287 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); 288 289 /* User can only change condition codes and %asi in %tstate. */ 290 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); 291 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); 292 293 err |= __get_user(fpu_save, &sf->fpu_save); 294 if (!err && fpu_save) 295 err |= restore_fpu_state(regs, fpu_save); 296 297 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); 298 err |= restore_altstack(&sf->stack); 299 if (err) 300 goto segv; 301 302 err |= __get_user(rwin_save, &sf->rwin_save); 303 if (!err && rwin_save) { 304 if (restore_rwin_state(rwin_save)) 305 goto segv; 306 } 307 308 regs->tpc = tpc; 309 regs->tnpc = tnpc; 310 311 /* Prevent syscall restart. */ 312 pt_regs_clear_syscall(regs); 313 314 set_current_blocked(&set); 315 return; 316 segv: 317 force_sig(SIGSEGV, current); 318 } 319 320 /* Checks if the fp is valid */ 321 static int invalid_frame_pointer(void __user *fp) 322 { 323 if (((unsigned long) fp) & 15) 324 return 1; 325 return 0; 326 } 327 328 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) 329 { 330 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; 331 332 /* 333 * If we are on the alternate signal stack and would overflow it, don't. 334 * Return an always-bogus address instead so we will die with SIGSEGV. 335 */ 336 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) 337 return (void __user *) -1L; 338 339 /* This is the X/Open sanctioned signal stack switching. */ 340 if (ka->sa.sa_flags & SA_ONSTACK) { 341 if (sas_ss_flags(sp) == 0) 342 sp = current->sas_ss_sp + current->sas_ss_size; 343 } 344 345 sp -= framesize; 346 347 /* Always align the stack frame. This handles two cases. First, 348 * sigaltstack need not be mindful of platform specific stack 349 * alignment. Second, if we took this signal because the stack 350 * is not aligned properly, we'd like to take the signal cleanly 351 * and report that. 352 */ 353 sp &= ~15UL; 354 355 return (void __user *) sp; 356 } 357 358 static inline int 359 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, 360 int signo, sigset_t *oldset, siginfo_t *info) 361 { 362 struct rt_signal_frame __user *sf; 363 int wsaved, err, sf_size; 364 void __user *tail; 365 366 /* 1. Make sure everything is clean */ 367 synchronize_user_stack(); 368 save_and_clear_fpu(); 369 370 wsaved = get_thread_wsaved(); 371 372 sf_size = sizeof(struct rt_signal_frame); 373 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 374 sf_size += sizeof(__siginfo_fpu_t); 375 if (wsaved) 376 sf_size += sizeof(__siginfo_rwin_t); 377 sf = (struct rt_signal_frame __user *) 378 get_sigframe(ka, regs, sf_size); 379 380 if (invalid_frame_pointer (sf)) 381 goto sigill; 382 383 tail = (sf + 1); 384 385 /* 2. Save the current process state */ 386 err = copy_to_user(&sf->regs, regs, sizeof (*regs)); 387 388 if (current_thread_info()->fpsaved[0] & FPRS_FEF) { 389 __siginfo_fpu_t __user *fpu_save = tail; 390 tail += sizeof(__siginfo_fpu_t); 391 err |= save_fpu_state(regs, fpu_save); 392 err |= __put_user((u64)fpu_save, &sf->fpu_save); 393 } else { 394 err |= __put_user(0, &sf->fpu_save); 395 } 396 if (wsaved) { 397 __siginfo_rwin_t __user *rwin_save = tail; 398 tail += sizeof(__siginfo_rwin_t); 399 err |= save_rwin_state(wsaved, rwin_save); 400 err |= __put_user((u64)rwin_save, &sf->rwin_save); 401 set_thread_wsaved(0); 402 } else { 403 err |= __put_user(0, &sf->rwin_save); 404 } 405 406 /* Setup sigaltstack */ 407 err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]); 408 409 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); 410 411 if (!wsaved) { 412 err |= copy_in_user((u64 __user *)sf, 413 (u64 __user *)(regs->u_regs[UREG_FP] + 414 STACK_BIAS), 415 sizeof(struct reg_window)); 416 } else { 417 struct reg_window *rp; 418 419 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 420 err |= copy_to_user(sf, rp, sizeof(struct reg_window)); 421 } 422 if (info) 423 err |= copy_siginfo_to_user(&sf->info, info); 424 else { 425 err |= __put_user(signo, &sf->info.si_signo); 426 err |= __put_user(SI_NOINFO, &sf->info.si_code); 427 } 428 if (err) 429 goto sigsegv; 430 431 /* 3. signal handler back-trampoline and parameters */ 432 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; 433 regs->u_regs[UREG_I0] = signo; 434 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 435 436 /* The sigcontext is passed in this way because of how it 437 * is defined in GLIBC's /usr/include/bits/sigcontext.h 438 * for sparc64. It includes the 128 bytes of siginfo_t. 439 */ 440 regs->u_regs[UREG_I2] = (unsigned long) &sf->info; 441 442 /* 5. signal handler */ 443 regs->tpc = (unsigned long) ka->sa.sa_handler; 444 regs->tnpc = (regs->tpc + 4); 445 if (test_thread_flag(TIF_32BIT)) { 446 regs->tpc &= 0xffffffff; 447 regs->tnpc &= 0xffffffff; 448 } 449 /* 4. return to kernel instructions */ 450 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; 451 return 0; 452 453 sigill: 454 do_exit(SIGILL); 455 return -EINVAL; 456 457 sigsegv: 458 force_sigsegv(signo, current); 459 return -EFAULT; 460 } 461 462 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, 463 siginfo_t *info, 464 sigset_t *oldset, struct pt_regs *regs) 465 { 466 int err; 467 468 err = setup_rt_frame(ka, regs, signr, oldset, 469 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); 470 if (err) 471 return; 472 473 signal_delivered(signr, info, ka, regs, 0); 474 } 475 476 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, 477 struct sigaction *sa) 478 { 479 switch (regs->u_regs[UREG_I0]) { 480 case ERESTART_RESTARTBLOCK: 481 case ERESTARTNOHAND: 482 no_system_call_restart: 483 regs->u_regs[UREG_I0] = EINTR; 484 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); 485 break; 486 case ERESTARTSYS: 487 if (!(sa->sa_flags & SA_RESTART)) 488 goto no_system_call_restart; 489 /* fallthrough */ 490 case ERESTARTNOINTR: 491 regs->u_regs[UREG_I0] = orig_i0; 492 regs->tpc -= 4; 493 regs->tnpc -= 4; 494 } 495 } 496 497 /* Note that 'init' is a special process: it doesn't get signals it doesn't 498 * want to handle. Thus you cannot kill init even with a SIGKILL even by 499 * mistake. 500 */ 501 static void do_signal(struct pt_regs *regs, unsigned long orig_i0) 502 { 503 struct k_sigaction ka; 504 int restart_syscall; 505 sigset_t *oldset = sigmask_to_save(); 506 siginfo_t info; 507 int signr; 508 509 /* It's a lot of work and synchronization to add a new ptrace 510 * register for GDB to save and restore in order to get 511 * orig_i0 correct for syscall restarts when debugging. 512 * 513 * Although it should be the case that most of the global 514 * registers are volatile across a system call, glibc already 515 * depends upon that fact that we preserve them. So we can't 516 * just use any global register to save away the orig_i0 value. 517 * 518 * In particular %g2, %g3, %g4, and %g5 are all assumed to be 519 * preserved across a system call trap by various pieces of 520 * code in glibc. 521 * 522 * %g7 is used as the "thread register". %g6 is not used in 523 * any fixed manner. %g6 is used as a scratch register and 524 * a compiler temporary, but it's value is never used across 525 * a system call. Therefore %g6 is usable for orig_i0 storage. 526 */ 527 if (pt_regs_is_syscall(regs) && 528 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) 529 regs->u_regs[UREG_G6] = orig_i0; 530 531 #ifdef CONFIG_COMPAT 532 if (test_thread_flag(TIF_32BIT)) { 533 extern void do_signal32(sigset_t *, struct pt_regs *); 534 do_signal32(oldset, regs); 535 return; 536 } 537 #endif 538 539 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 540 541 restart_syscall = 0; 542 if (pt_regs_is_syscall(regs) && 543 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { 544 restart_syscall = 1; 545 orig_i0 = regs->u_regs[UREG_G6]; 546 } 547 548 if (signr > 0) { 549 if (restart_syscall) 550 syscall_restart(orig_i0, regs, &ka.sa); 551 handle_signal(signr, &ka, &info, oldset, regs); 552 return; 553 } 554 if (restart_syscall && 555 (regs->u_regs[UREG_I0] == ERESTARTNOHAND || 556 regs->u_regs[UREG_I0] == ERESTARTSYS || 557 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { 558 /* replay the system call when we are done */ 559 regs->u_regs[UREG_I0] = orig_i0; 560 regs->tpc -= 4; 561 regs->tnpc -= 4; 562 pt_regs_clear_syscall(regs); 563 } 564 if (restart_syscall && 565 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { 566 regs->u_regs[UREG_G1] = __NR_restart_syscall; 567 regs->tpc -= 4; 568 regs->tnpc -= 4; 569 pt_regs_clear_syscall(regs); 570 } 571 572 /* If there's no signal to deliver, we just put the saved sigmask 573 * back 574 */ 575 restore_saved_sigmask(); 576 } 577 578 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) 579 { 580 if (thread_info_flags & _TIF_SIGPENDING) 581 do_signal(regs, orig_i0); 582 if (thread_info_flags & _TIF_NOTIFY_RESUME) { 583 clear_thread_flag(TIF_NOTIFY_RESUME); 584 tracehook_notify_resume(regs); 585 } 586 } 587 588