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 35 #include "entry.h" 36 #include "systbls.h" 37 #include "sigutil.h" 38 39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 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 sigdelsetmask(&set, ~_BLOCKABLE); 73 set_current_blocked(&set); 74 } 75 if (test_thread_flag(TIF_32BIT)) { 76 pc &= 0xffffffff; 77 npc &= 0xffffffff; 78 } 79 regs->tpc = pc; 80 regs->tnpc = npc; 81 err |= __get_user(regs->y, &((*grp)[MC_Y])); 82 err |= __get_user(tstate, &((*grp)[MC_TSTATE])); 83 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); 84 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); 85 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); 86 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); 87 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); 88 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); 89 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); 90 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); 91 92 /* Skip %g7 as that's the thread register in userspace. */ 93 94 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); 95 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); 96 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); 97 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); 98 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); 99 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); 100 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); 101 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); 102 103 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); 104 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); 105 err |= __put_user(fp, 106 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); 107 err |= __put_user(i7, 108 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); 109 110 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); 111 if (fenab) { 112 unsigned long *fpregs = current_thread_info()->fpregs; 113 unsigned long fprs; 114 115 fprs_write(0); 116 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); 117 if (fprs & FPRS_DL) 118 err |= copy_from_user(fpregs, 119 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), 120 (sizeof(unsigned int) * 32)); 121 if (fprs & FPRS_DU) 122 err |= copy_from_user(fpregs+16, 123 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, 124 (sizeof(unsigned int) * 32)); 125 err |= __get_user(current_thread_info()->xfsr[0], 126 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); 127 err |= __get_user(current_thread_info()->gsr[0], 128 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); 129 regs->tstate &= ~TSTATE_PEF; 130 } 131 if (err) 132 goto do_sigsegv; 133 134 return; 135 do_sigsegv: 136 force_sig(SIGSEGV, current); 137 } 138 139 asmlinkage void sparc64_get_context(struct pt_regs *regs) 140 { 141 struct ucontext __user *ucp = (struct ucontext __user *) 142 regs->u_regs[UREG_I0]; 143 mc_gregset_t __user *grp; 144 mcontext_t __user *mcp; 145 unsigned long fp, i7; 146 unsigned char fenab; 147 int err; 148 149 synchronize_user_stack(); 150 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) 151 goto do_sigsegv; 152 153 #if 1 154 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ 155 #else 156 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); 157 #endif 158 159 mcp = &ucp->uc_mcontext; 160 grp = &mcp->mc_gregs; 161 162 /* Skip over the trap instruction, first. */ 163 if (test_thread_flag(TIF_32BIT)) { 164 regs->tpc = (regs->tnpc & 0xffffffff); 165 regs->tnpc = (regs->tnpc + 4) & 0xffffffff; 166 } else { 167 regs->tpc = regs->tnpc; 168 regs->tnpc += 4; 169 } 170 err = 0; 171 if (_NSIG_WORDS == 1) 172 err |= __put_user(current->blocked.sig[0], 173 (unsigned long __user *)&ucp->uc_sigmask); 174 else 175 err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, 176 sizeof(sigset_t)); 177 178 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); 179 err |= __put_user(regs->tpc, &((*grp)[MC_PC])); 180 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); 181 err |= __put_user(regs->y, &((*grp)[MC_Y])); 182 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); 183 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); 184 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); 185 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); 186 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); 187 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); 188 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); 189 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); 190 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); 191 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); 192 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); 193 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); 194 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); 195 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); 196 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); 197 198 err |= __get_user(fp, 199 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); 200 err |= __get_user(i7, 201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); 202 err |= __put_user(fp, &(mcp->mc_fp)); 203 err |= __put_user(i7, &(mcp->mc_i7)); 204 205 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); 206 if (fenab) { 207 unsigned long *fpregs = current_thread_info()->fpregs; 208 unsigned long fprs; 209 210 fprs = current_thread_info()->fpsaved[0]; 211 if (fprs & FPRS_DL) 212 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, 213 (sizeof(unsigned int) * 32)); 214 if (fprs & FPRS_DU) 215 err |= copy_to_user( 216 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, 217 (sizeof(unsigned int) * 32)); 218 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); 219 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); 220 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); 221 } 222 if (err) 223 goto do_sigsegv; 224 225 return; 226 do_sigsegv: 227 force_sig(SIGSEGV, current); 228 } 229 230 struct rt_signal_frame { 231 struct sparc_stackf ss; 232 siginfo_t info; 233 struct pt_regs regs; 234 __siginfo_fpu_t __user *fpu_save; 235 stack_t stack; 236 sigset_t mask; 237 __siginfo_rwin_t *rwin_save; 238 }; 239 240 static long _sigpause_common(old_sigset_t set) 241 { 242 sigset_t blocked; 243 244 current->saved_sigmask = current->blocked; 245 246 set &= _BLOCKABLE; 247 siginitset(&blocked, set); 248 set_current_blocked(&blocked); 249 250 current->state = TASK_INTERRUPTIBLE; 251 schedule(); 252 253 set_restore_sigmask(); 254 255 return -ERESTARTNOHAND; 256 } 257 258 asmlinkage long sys_sigpause(unsigned int set) 259 { 260 return _sigpause_common(set); 261 } 262 263 asmlinkage long sys_sigsuspend(old_sigset_t set) 264 { 265 return _sigpause_common(set); 266 } 267 268 void do_rt_sigreturn(struct pt_regs *regs) 269 { 270 struct rt_signal_frame __user *sf; 271 unsigned long tpc, tnpc, tstate; 272 __siginfo_fpu_t __user *fpu_save; 273 __siginfo_rwin_t __user *rwin_save; 274 sigset_t set; 275 int err; 276 277 /* Always make any pending restarted system calls return -EINTR */ 278 current_thread_info()->restart_block.fn = do_no_restart_syscall; 279 280 synchronize_user_stack (); 281 sf = (struct rt_signal_frame __user *) 282 (regs->u_regs [UREG_FP] + STACK_BIAS); 283 284 /* 1. Make sure we are not getting garbage from the user */ 285 if (((unsigned long) sf) & 3) 286 goto segv; 287 288 err = get_user(tpc, &sf->regs.tpc); 289 err |= __get_user(tnpc, &sf->regs.tnpc); 290 if (test_thread_flag(TIF_32BIT)) { 291 tpc &= 0xffffffff; 292 tnpc &= 0xffffffff; 293 } 294 err |= ((tpc | tnpc) & 3); 295 296 /* 2. Restore the state */ 297 err |= __get_user(regs->y, &sf->regs.y); 298 err |= __get_user(tstate, &sf->regs.tstate); 299 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); 300 301 /* User can only change condition codes and %asi in %tstate. */ 302 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); 303 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); 304 305 err |= __get_user(fpu_save, &sf->fpu_save); 306 if (!err && fpu_save) 307 err |= restore_fpu_state(regs, fpu_save); 308 309 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); 310 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf); 311 312 if (err) 313 goto segv; 314 315 err |= __get_user(rwin_save, &sf->rwin_save); 316 if (!err && rwin_save) { 317 if (restore_rwin_state(rwin_save)) 318 goto segv; 319 } 320 321 regs->tpc = tpc; 322 regs->tnpc = tnpc; 323 324 /* Prevent syscall restart. */ 325 pt_regs_clear_syscall(regs); 326 327 sigdelsetmask(&set, ~_BLOCKABLE); 328 set_current_blocked(&set); 329 return; 330 segv: 331 force_sig(SIGSEGV, current); 332 } 333 334 /* Checks if the fp is valid */ 335 static int invalid_frame_pointer(void __user *fp) 336 { 337 if (((unsigned long) fp) & 15) 338 return 1; 339 return 0; 340 } 341 342 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) 343 { 344 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; 345 346 /* 347 * If we are on the alternate signal stack and would overflow it, don't. 348 * Return an always-bogus address instead so we will die with SIGSEGV. 349 */ 350 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) 351 return (void __user *) -1L; 352 353 /* This is the X/Open sanctioned signal stack switching. */ 354 if (ka->sa.sa_flags & SA_ONSTACK) { 355 if (sas_ss_flags(sp) == 0) 356 sp = current->sas_ss_sp + current->sas_ss_size; 357 } 358 359 sp -= framesize; 360 361 /* Always align the stack frame. This handles two cases. First, 362 * sigaltstack need not be mindful of platform specific stack 363 * alignment. Second, if we took this signal because the stack 364 * is not aligned properly, we'd like to take the signal cleanly 365 * and report that. 366 */ 367 sp &= ~15UL; 368 369 return (void __user *) sp; 370 } 371 372 static inline int 373 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, 374 int signo, sigset_t *oldset, siginfo_t *info) 375 { 376 struct rt_signal_frame __user *sf; 377 int wsaved, err, sf_size; 378 void __user *tail; 379 380 /* 1. Make sure everything is clean */ 381 synchronize_user_stack(); 382 save_and_clear_fpu(); 383 384 wsaved = get_thread_wsaved(); 385 386 sf_size = sizeof(struct rt_signal_frame); 387 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 388 sf_size += sizeof(__siginfo_fpu_t); 389 if (wsaved) 390 sf_size += sizeof(__siginfo_rwin_t); 391 sf = (struct rt_signal_frame __user *) 392 get_sigframe(ka, regs, sf_size); 393 394 if (invalid_frame_pointer (sf)) 395 goto sigill; 396 397 tail = (sf + 1); 398 399 /* 2. Save the current process state */ 400 err = copy_to_user(&sf->regs, regs, sizeof (*regs)); 401 402 if (current_thread_info()->fpsaved[0] & FPRS_FEF) { 403 __siginfo_fpu_t __user *fpu_save = tail; 404 tail += sizeof(__siginfo_fpu_t); 405 err |= save_fpu_state(regs, fpu_save); 406 err |= __put_user((u64)fpu_save, &sf->fpu_save); 407 } else { 408 err |= __put_user(0, &sf->fpu_save); 409 } 410 if (wsaved) { 411 __siginfo_rwin_t __user *rwin_save = tail; 412 tail += sizeof(__siginfo_rwin_t); 413 err |= save_rwin_state(wsaved, rwin_save); 414 err |= __put_user((u64)rwin_save, &sf->rwin_save); 415 set_thread_wsaved(0); 416 } else { 417 err |= __put_user(0, &sf->rwin_save); 418 } 419 420 /* Setup sigaltstack */ 421 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); 422 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); 423 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); 424 425 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); 426 427 if (!wsaved) { 428 err |= copy_in_user((u64 __user *)sf, 429 (u64 __user *)(regs->u_regs[UREG_FP] + 430 STACK_BIAS), 431 sizeof(struct reg_window)); 432 } else { 433 struct reg_window *rp; 434 435 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 436 err |= copy_to_user(sf, rp, sizeof(struct reg_window)); 437 } 438 if (info) 439 err |= copy_siginfo_to_user(&sf->info, info); 440 else { 441 err |= __put_user(signo, &sf->info.si_signo); 442 err |= __put_user(SI_NOINFO, &sf->info.si_code); 443 } 444 if (err) 445 goto sigsegv; 446 447 /* 3. signal handler back-trampoline and parameters */ 448 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; 449 regs->u_regs[UREG_I0] = signo; 450 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 451 452 /* The sigcontext is passed in this way because of how it 453 * is defined in GLIBC's /usr/include/bits/sigcontext.h 454 * for sparc64. It includes the 128 bytes of siginfo_t. 455 */ 456 regs->u_regs[UREG_I2] = (unsigned long) &sf->info; 457 458 /* 5. signal handler */ 459 regs->tpc = (unsigned long) ka->sa.sa_handler; 460 regs->tnpc = (regs->tpc + 4); 461 if (test_thread_flag(TIF_32BIT)) { 462 regs->tpc &= 0xffffffff; 463 regs->tnpc &= 0xffffffff; 464 } 465 /* 4. return to kernel instructions */ 466 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; 467 return 0; 468 469 sigill: 470 do_exit(SIGILL); 471 return -EINVAL; 472 473 sigsegv: 474 force_sigsegv(signo, current); 475 return -EFAULT; 476 } 477 478 static inline int handle_signal(unsigned long signr, struct k_sigaction *ka, 479 siginfo_t *info, 480 sigset_t *oldset, struct pt_regs *regs) 481 { 482 sigset_t blocked; 483 int err; 484 485 err = setup_rt_frame(ka, regs, signr, oldset, 486 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); 487 if (err) 488 return err; 489 sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); 490 if (!(ka->sa.sa_flags & SA_NOMASK)) 491 sigaddset(&blocked, signr); 492 set_current_blocked(&blocked); 493 494 tracehook_signal_handler(signr, info, ka, regs, 0); 495 496 return 0; 497 } 498 499 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, 500 struct sigaction *sa) 501 { 502 switch (regs->u_regs[UREG_I0]) { 503 case ERESTART_RESTARTBLOCK: 504 case ERESTARTNOHAND: 505 no_system_call_restart: 506 regs->u_regs[UREG_I0] = EINTR; 507 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); 508 break; 509 case ERESTARTSYS: 510 if (!(sa->sa_flags & SA_RESTART)) 511 goto no_system_call_restart; 512 /* fallthrough */ 513 case ERESTARTNOINTR: 514 regs->u_regs[UREG_I0] = orig_i0; 515 regs->tpc -= 4; 516 regs->tnpc -= 4; 517 } 518 } 519 520 /* Note that 'init' is a special process: it doesn't get signals it doesn't 521 * want to handle. Thus you cannot kill init even with a SIGKILL even by 522 * mistake. 523 */ 524 static void do_signal(struct pt_regs *regs, unsigned long orig_i0) 525 { 526 struct k_sigaction ka; 527 int restart_syscall; 528 sigset_t *oldset; 529 siginfo_t info; 530 int signr; 531 532 if (pt_regs_is_syscall(regs) && 533 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { 534 restart_syscall = 1; 535 } else 536 restart_syscall = 0; 537 538 if (current_thread_info()->status & TS_RESTORE_SIGMASK) 539 oldset = ¤t->saved_sigmask; 540 else 541 oldset = ¤t->blocked; 542 543 #ifdef CONFIG_COMPAT 544 if (test_thread_flag(TIF_32BIT)) { 545 extern void do_signal32(sigset_t *, struct pt_regs *, 546 int restart_syscall, 547 unsigned long orig_i0); 548 do_signal32(oldset, regs, restart_syscall, orig_i0); 549 return; 550 } 551 #endif 552 553 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 554 555 /* If the debugger messes with the program counter, it clears 556 * the software "in syscall" bit, directing us to not perform 557 * a syscall restart. 558 */ 559 if (restart_syscall && !pt_regs_is_syscall(regs)) 560 restart_syscall = 0; 561 562 if (signr > 0) { 563 if (restart_syscall) 564 syscall_restart(orig_i0, regs, &ka.sa); 565 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { 566 /* A signal was successfully delivered; the saved 567 * sigmask will have been stored in the signal frame, 568 * and will be restored by sigreturn, so we can simply 569 * clear the TS_RESTORE_SIGMASK flag. 570 */ 571 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 572 } 573 return; 574 } 575 if (restart_syscall && 576 (regs->u_regs[UREG_I0] == ERESTARTNOHAND || 577 regs->u_regs[UREG_I0] == ERESTARTSYS || 578 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { 579 /* replay the system call when we are done */ 580 regs->u_regs[UREG_I0] = orig_i0; 581 regs->tpc -= 4; 582 regs->tnpc -= 4; 583 pt_regs_clear_syscall(regs); 584 } 585 if (restart_syscall && 586 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { 587 regs->u_regs[UREG_G1] = __NR_restart_syscall; 588 regs->tpc -= 4; 589 regs->tnpc -= 4; 590 pt_regs_clear_syscall(regs); 591 } 592 593 /* If there's no signal to deliver, we just put the saved sigmask 594 * back 595 */ 596 if (current_thread_info()->status & TS_RESTORE_SIGMASK) { 597 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 598 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); 599 } 600 } 601 602 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) 603 { 604 if (thread_info_flags & _TIF_SIGPENDING) 605 do_signal(regs, orig_i0); 606 if (thread_info_flags & _TIF_NOTIFY_RESUME) { 607 clear_thread_flag(TIF_NOTIFY_RESUME); 608 tracehook_notify_resume(regs); 609 if (current->replacement_session_keyring) 610 key_replace_session_keyring(); 611 } 612 } 613 614