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 if (err || do_sigaltstack(&sf->stack, NULL, (unsigned long)sf) == -EFAULT) 299 goto segv; 300 301 err |= __get_user(rwin_save, &sf->rwin_save); 302 if (!err && rwin_save) { 303 if (restore_rwin_state(rwin_save)) 304 goto segv; 305 } 306 307 regs->tpc = tpc; 308 regs->tnpc = tnpc; 309 310 /* Prevent syscall restart. */ 311 pt_regs_clear_syscall(regs); 312 313 set_current_blocked(&set); 314 return; 315 segv: 316 force_sig(SIGSEGV, current); 317 } 318 319 /* Checks if the fp is valid */ 320 static int invalid_frame_pointer(void __user *fp) 321 { 322 if (((unsigned long) fp) & 15) 323 return 1; 324 return 0; 325 } 326 327 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) 328 { 329 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; 330 331 /* 332 * If we are on the alternate signal stack and would overflow it, don't. 333 * Return an always-bogus address instead so we will die with SIGSEGV. 334 */ 335 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) 336 return (void __user *) -1L; 337 338 /* This is the X/Open sanctioned signal stack switching. */ 339 if (ka->sa.sa_flags & SA_ONSTACK) { 340 if (sas_ss_flags(sp) == 0) 341 sp = current->sas_ss_sp + current->sas_ss_size; 342 } 343 344 sp -= framesize; 345 346 /* Always align the stack frame. This handles two cases. First, 347 * sigaltstack need not be mindful of platform specific stack 348 * alignment. Second, if we took this signal because the stack 349 * is not aligned properly, we'd like to take the signal cleanly 350 * and report that. 351 */ 352 sp &= ~15UL; 353 354 return (void __user *) sp; 355 } 356 357 static inline int 358 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, 359 int signo, sigset_t *oldset, siginfo_t *info) 360 { 361 struct rt_signal_frame __user *sf; 362 int wsaved, err, sf_size; 363 void __user *tail; 364 365 /* 1. Make sure everything is clean */ 366 synchronize_user_stack(); 367 save_and_clear_fpu(); 368 369 wsaved = get_thread_wsaved(); 370 371 sf_size = sizeof(struct rt_signal_frame); 372 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 373 sf_size += sizeof(__siginfo_fpu_t); 374 if (wsaved) 375 sf_size += sizeof(__siginfo_rwin_t); 376 sf = (struct rt_signal_frame __user *) 377 get_sigframe(ka, regs, sf_size); 378 379 if (invalid_frame_pointer (sf)) 380 goto sigill; 381 382 tail = (sf + 1); 383 384 /* 2. Save the current process state */ 385 err = copy_to_user(&sf->regs, regs, sizeof (*regs)); 386 387 if (current_thread_info()->fpsaved[0] & FPRS_FEF) { 388 __siginfo_fpu_t __user *fpu_save = tail; 389 tail += sizeof(__siginfo_fpu_t); 390 err |= save_fpu_state(regs, fpu_save); 391 err |= __put_user((u64)fpu_save, &sf->fpu_save); 392 } else { 393 err |= __put_user(0, &sf->fpu_save); 394 } 395 if (wsaved) { 396 __siginfo_rwin_t __user *rwin_save = tail; 397 tail += sizeof(__siginfo_rwin_t); 398 err |= save_rwin_state(wsaved, rwin_save); 399 err |= __put_user((u64)rwin_save, &sf->rwin_save); 400 set_thread_wsaved(0); 401 } else { 402 err |= __put_user(0, &sf->rwin_save); 403 } 404 405 /* Setup sigaltstack */ 406 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); 407 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); 408 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); 409 410 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); 411 412 if (!wsaved) { 413 err |= copy_in_user((u64 __user *)sf, 414 (u64 __user *)(regs->u_regs[UREG_FP] + 415 STACK_BIAS), 416 sizeof(struct reg_window)); 417 } else { 418 struct reg_window *rp; 419 420 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 421 err |= copy_to_user(sf, rp, sizeof(struct reg_window)); 422 } 423 if (info) 424 err |= copy_siginfo_to_user(&sf->info, info); 425 else { 426 err |= __put_user(signo, &sf->info.si_signo); 427 err |= __put_user(SI_NOINFO, &sf->info.si_code); 428 } 429 if (err) 430 goto sigsegv; 431 432 /* 3. signal handler back-trampoline and parameters */ 433 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; 434 regs->u_regs[UREG_I0] = signo; 435 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 436 437 /* The sigcontext is passed in this way because of how it 438 * is defined in GLIBC's /usr/include/bits/sigcontext.h 439 * for sparc64. It includes the 128 bytes of siginfo_t. 440 */ 441 regs->u_regs[UREG_I2] = (unsigned long) &sf->info; 442 443 /* 5. signal handler */ 444 regs->tpc = (unsigned long) ka->sa.sa_handler; 445 regs->tnpc = (regs->tpc + 4); 446 if (test_thread_flag(TIF_32BIT)) { 447 regs->tpc &= 0xffffffff; 448 regs->tnpc &= 0xffffffff; 449 } 450 /* 4. return to kernel instructions */ 451 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; 452 return 0; 453 454 sigill: 455 do_exit(SIGILL); 456 return -EINVAL; 457 458 sigsegv: 459 force_sigsegv(signo, current); 460 return -EFAULT; 461 } 462 463 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, 464 siginfo_t *info, 465 sigset_t *oldset, struct pt_regs *regs) 466 { 467 int err; 468 469 err = setup_rt_frame(ka, regs, signr, oldset, 470 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); 471 if (err) 472 return; 473 474 signal_delivered(signr, info, ka, regs, 0); 475 } 476 477 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, 478 struct sigaction *sa) 479 { 480 switch (regs->u_regs[UREG_I0]) { 481 case ERESTART_RESTARTBLOCK: 482 case ERESTARTNOHAND: 483 no_system_call_restart: 484 regs->u_regs[UREG_I0] = EINTR; 485 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); 486 break; 487 case ERESTARTSYS: 488 if (!(sa->sa_flags & SA_RESTART)) 489 goto no_system_call_restart; 490 /* fallthrough */ 491 case ERESTARTNOINTR: 492 regs->u_regs[UREG_I0] = orig_i0; 493 regs->tpc -= 4; 494 regs->tnpc -= 4; 495 } 496 } 497 498 /* Note that 'init' is a special process: it doesn't get signals it doesn't 499 * want to handle. Thus you cannot kill init even with a SIGKILL even by 500 * mistake. 501 */ 502 static void do_signal(struct pt_regs *regs, unsigned long orig_i0) 503 { 504 struct k_sigaction ka; 505 int restart_syscall; 506 sigset_t *oldset = sigmask_to_save(); 507 siginfo_t info; 508 int signr; 509 510 /* It's a lot of work and synchronization to add a new ptrace 511 * register for GDB to save and restore in order to get 512 * orig_i0 correct for syscall restarts when debugging. 513 * 514 * Although it should be the case that most of the global 515 * registers are volatile across a system call, glibc already 516 * depends upon that fact that we preserve them. So we can't 517 * just use any global register to save away the orig_i0 value. 518 * 519 * In particular %g2, %g3, %g4, and %g5 are all assumed to be 520 * preserved across a system call trap by various pieces of 521 * code in glibc. 522 * 523 * %g7 is used as the "thread register". %g6 is not used in 524 * any fixed manner. %g6 is used as a scratch register and 525 * a compiler temporary, but it's value is never used across 526 * a system call. Therefore %g6 is usable for orig_i0 storage. 527 */ 528 if (pt_regs_is_syscall(regs) && 529 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) 530 regs->u_regs[UREG_G6] = orig_i0; 531 532 #ifdef CONFIG_COMPAT 533 if (test_thread_flag(TIF_32BIT)) { 534 extern void do_signal32(sigset_t *, struct pt_regs *); 535 do_signal32(oldset, regs); 536 return; 537 } 538 #endif 539 540 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 541 542 restart_syscall = 0; 543 if (pt_regs_is_syscall(regs) && 544 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { 545 restart_syscall = 1; 546 orig_i0 = regs->u_regs[UREG_G6]; 547 } 548 549 if (signr > 0) { 550 if (restart_syscall) 551 syscall_restart(orig_i0, regs, &ka.sa); 552 handle_signal(signr, &ka, &info, oldset, regs); 553 return; 554 } 555 if (restart_syscall && 556 (regs->u_regs[UREG_I0] == ERESTARTNOHAND || 557 regs->u_regs[UREG_I0] == ERESTARTSYS || 558 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { 559 /* replay the system call when we are done */ 560 regs->u_regs[UREG_I0] = orig_i0; 561 regs->tpc -= 4; 562 regs->tnpc -= 4; 563 pt_regs_clear_syscall(regs); 564 } 565 if (restart_syscall && 566 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { 567 regs->u_regs[UREG_G1] = __NR_restart_syscall; 568 regs->tpc -= 4; 569 regs->tnpc -= 4; 570 pt_regs_clear_syscall(regs); 571 } 572 573 /* If there's no signal to deliver, we just put the saved sigmask 574 * back 575 */ 576 restore_saved_sigmask(); 577 } 578 579 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) 580 { 581 if (thread_info_flags & _TIF_SIGPENDING) 582 do_signal(regs, orig_i0); 583 if (thread_info_flags & _TIF_NOTIFY_RESUME) { 584 clear_thread_flag(TIF_NOTIFY_RESUME); 585 tracehook_notify_resume(regs); 586 } 587 } 588 589