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 spin_lock_irq(¤t->sighand->siglock); 74 current->blocked = set; 75 recalc_sigpending(); 76 spin_unlock_irq(¤t->sighand->siglock); 77 } 78 if (test_thread_flag(TIF_32BIT)) { 79 pc &= 0xffffffff; 80 npc &= 0xffffffff; 81 } 82 regs->tpc = pc; 83 regs->tnpc = npc; 84 err |= __get_user(regs->y, &((*grp)[MC_Y])); 85 err |= __get_user(tstate, &((*grp)[MC_TSTATE])); 86 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); 87 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); 88 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); 89 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); 90 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); 91 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); 92 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); 93 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); 94 95 /* Skip %g7 as that's the thread register in userspace. */ 96 97 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); 98 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); 99 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); 100 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); 101 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); 102 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); 103 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); 104 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); 105 106 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); 107 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); 108 err |= __put_user(fp, 109 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); 110 err |= __put_user(i7, 111 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); 112 113 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); 114 if (fenab) { 115 unsigned long *fpregs = current_thread_info()->fpregs; 116 unsigned long fprs; 117 118 fprs_write(0); 119 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); 120 if (fprs & FPRS_DL) 121 err |= copy_from_user(fpregs, 122 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), 123 (sizeof(unsigned int) * 32)); 124 if (fprs & FPRS_DU) 125 err |= copy_from_user(fpregs+16, 126 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, 127 (sizeof(unsigned int) * 32)); 128 err |= __get_user(current_thread_info()->xfsr[0], 129 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); 130 err |= __get_user(current_thread_info()->gsr[0], 131 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); 132 regs->tstate &= ~TSTATE_PEF; 133 } 134 if (err) 135 goto do_sigsegv; 136 137 return; 138 do_sigsegv: 139 force_sig(SIGSEGV, current); 140 } 141 142 asmlinkage void sparc64_get_context(struct pt_regs *regs) 143 { 144 struct ucontext __user *ucp = (struct ucontext __user *) 145 regs->u_regs[UREG_I0]; 146 mc_gregset_t __user *grp; 147 mcontext_t __user *mcp; 148 unsigned long fp, i7; 149 unsigned char fenab; 150 int err; 151 152 synchronize_user_stack(); 153 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) 154 goto do_sigsegv; 155 156 #if 1 157 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ 158 #else 159 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); 160 #endif 161 162 mcp = &ucp->uc_mcontext; 163 grp = &mcp->mc_gregs; 164 165 /* Skip over the trap instruction, first. */ 166 if (test_thread_flag(TIF_32BIT)) { 167 regs->tpc = (regs->tnpc & 0xffffffff); 168 regs->tnpc = (regs->tnpc + 4) & 0xffffffff; 169 } else { 170 regs->tpc = regs->tnpc; 171 regs->tnpc += 4; 172 } 173 err = 0; 174 if (_NSIG_WORDS == 1) 175 err |= __put_user(current->blocked.sig[0], 176 (unsigned long __user *)&ucp->uc_sigmask); 177 else 178 err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, 179 sizeof(sigset_t)); 180 181 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); 182 err |= __put_user(regs->tpc, &((*grp)[MC_PC])); 183 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); 184 err |= __put_user(regs->y, &((*grp)[MC_Y])); 185 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); 186 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); 187 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); 188 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); 189 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); 190 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); 191 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); 192 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); 193 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); 194 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); 195 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); 196 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); 197 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); 198 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); 199 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); 200 201 err |= __get_user(fp, 202 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); 203 err |= __get_user(i7, 204 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); 205 err |= __put_user(fp, &(mcp->mc_fp)); 206 err |= __put_user(i7, &(mcp->mc_i7)); 207 208 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); 209 if (fenab) { 210 unsigned long *fpregs = current_thread_info()->fpregs; 211 unsigned long fprs; 212 213 fprs = current_thread_info()->fpsaved[0]; 214 if (fprs & FPRS_DL) 215 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, 216 (sizeof(unsigned int) * 32)); 217 if (fprs & FPRS_DU) 218 err |= copy_to_user( 219 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, 220 (sizeof(unsigned int) * 32)); 221 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); 222 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); 223 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); 224 } 225 if (err) 226 goto do_sigsegv; 227 228 return; 229 do_sigsegv: 230 force_sig(SIGSEGV, current); 231 } 232 233 struct rt_signal_frame { 234 struct sparc_stackf ss; 235 siginfo_t info; 236 struct pt_regs regs; 237 __siginfo_fpu_t __user *fpu_save; 238 stack_t stack; 239 sigset_t mask; 240 __siginfo_rwin_t *rwin_save; 241 }; 242 243 static long _sigpause_common(old_sigset_t set) 244 { 245 set &= _BLOCKABLE; 246 spin_lock_irq(¤t->sighand->siglock); 247 current->saved_sigmask = current->blocked; 248 siginitset(¤t->blocked, set); 249 recalc_sigpending(); 250 spin_unlock_irq(¤t->sighand->siglock); 251 252 current->state = TASK_INTERRUPTIBLE; 253 schedule(); 254 255 set_restore_sigmask(); 256 257 return -ERESTARTNOHAND; 258 } 259 260 asmlinkage long sys_sigpause(unsigned int set) 261 { 262 return _sigpause_common(set); 263 } 264 265 asmlinkage long sys_sigsuspend(old_sigset_t set) 266 { 267 return _sigpause_common(set); 268 } 269 270 void do_rt_sigreturn(struct pt_regs *regs) 271 { 272 struct rt_signal_frame __user *sf; 273 unsigned long tpc, tnpc, tstate; 274 __siginfo_fpu_t __user *fpu_save; 275 __siginfo_rwin_t __user *rwin_save; 276 sigset_t set; 277 int err; 278 279 /* Always make any pending restarted system calls return -EINTR */ 280 current_thread_info()->restart_block.fn = do_no_restart_syscall; 281 282 synchronize_user_stack (); 283 sf = (struct rt_signal_frame __user *) 284 (regs->u_regs [UREG_FP] + STACK_BIAS); 285 286 /* 1. Make sure we are not getting garbage from the user */ 287 if (((unsigned long) sf) & 3) 288 goto segv; 289 290 err = get_user(tpc, &sf->regs.tpc); 291 err |= __get_user(tnpc, &sf->regs.tnpc); 292 if (test_thread_flag(TIF_32BIT)) { 293 tpc &= 0xffffffff; 294 tnpc &= 0xffffffff; 295 } 296 err |= ((tpc | tnpc) & 3); 297 298 /* 2. Restore the state */ 299 err |= __get_user(regs->y, &sf->regs.y); 300 err |= __get_user(tstate, &sf->regs.tstate); 301 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); 302 303 /* User can only change condition codes and %asi in %tstate. */ 304 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); 305 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); 306 307 err |= __get_user(fpu_save, &sf->fpu_save); 308 if (!err && fpu_save) 309 err |= restore_fpu_state(regs, fpu_save); 310 311 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); 312 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf); 313 314 if (err) 315 goto segv; 316 317 err |= __get_user(rwin_save, &sf->rwin_save); 318 if (!err && rwin_save) { 319 if (restore_rwin_state(rwin_save)) 320 goto segv; 321 } 322 323 regs->tpc = tpc; 324 regs->tnpc = tnpc; 325 326 /* Prevent syscall restart. */ 327 pt_regs_clear_syscall(regs); 328 329 sigdelsetmask(&set, ~_BLOCKABLE); 330 spin_lock_irq(¤t->sighand->siglock); 331 current->blocked = set; 332 recalc_sigpending(); 333 spin_unlock_irq(¤t->sighand->siglock); 334 return; 335 segv: 336 force_sig(SIGSEGV, current); 337 } 338 339 /* Checks if the fp is valid */ 340 static int invalid_frame_pointer(void __user *fp) 341 { 342 if (((unsigned long) fp) & 15) 343 return 1; 344 return 0; 345 } 346 347 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) 348 { 349 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; 350 351 /* 352 * If we are on the alternate signal stack and would overflow it, don't. 353 * Return an always-bogus address instead so we will die with SIGSEGV. 354 */ 355 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) 356 return (void __user *) -1L; 357 358 /* This is the X/Open sanctioned signal stack switching. */ 359 if (ka->sa.sa_flags & SA_ONSTACK) { 360 if (sas_ss_flags(sp) == 0) 361 sp = current->sas_ss_sp + current->sas_ss_size; 362 } 363 364 sp -= framesize; 365 366 /* Always align the stack frame. This handles two cases. First, 367 * sigaltstack need not be mindful of platform specific stack 368 * alignment. Second, if we took this signal because the stack 369 * is not aligned properly, we'd like to take the signal cleanly 370 * and report that. 371 */ 372 sp &= ~15UL; 373 374 return (void __user *) sp; 375 } 376 377 static inline int 378 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, 379 int signo, sigset_t *oldset, siginfo_t *info) 380 { 381 struct rt_signal_frame __user *sf; 382 int wsaved, err, sf_size; 383 void __user *tail; 384 385 /* 1. Make sure everything is clean */ 386 synchronize_user_stack(); 387 save_and_clear_fpu(); 388 389 wsaved = get_thread_wsaved(); 390 391 sf_size = sizeof(struct rt_signal_frame); 392 if (current_thread_info()->fpsaved[0] & FPRS_FEF) 393 sf_size += sizeof(__siginfo_fpu_t); 394 if (wsaved) 395 sf_size += sizeof(__siginfo_rwin_t); 396 sf = (struct rt_signal_frame __user *) 397 get_sigframe(ka, regs, sf_size); 398 399 if (invalid_frame_pointer (sf)) 400 goto sigill; 401 402 tail = (sf + 1); 403 404 /* 2. Save the current process state */ 405 err = copy_to_user(&sf->regs, regs, sizeof (*regs)); 406 407 if (current_thread_info()->fpsaved[0] & FPRS_FEF) { 408 __siginfo_fpu_t __user *fpu_save = tail; 409 tail += sizeof(__siginfo_fpu_t); 410 err |= save_fpu_state(regs, fpu_save); 411 err |= __put_user((u64)fpu_save, &sf->fpu_save); 412 } else { 413 err |= __put_user(0, &sf->fpu_save); 414 } 415 if (wsaved) { 416 __siginfo_rwin_t __user *rwin_save = tail; 417 tail += sizeof(__siginfo_rwin_t); 418 err |= save_rwin_state(wsaved, rwin_save); 419 err |= __put_user((u64)rwin_save, &sf->rwin_save); 420 set_thread_wsaved(0); 421 } else { 422 err |= __put_user(0, &sf->rwin_save); 423 } 424 425 /* Setup sigaltstack */ 426 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); 427 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); 428 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); 429 430 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t)); 431 432 if (!wsaved) { 433 err |= copy_in_user((u64 __user *)sf, 434 (u64 __user *)(regs->u_regs[UREG_FP] + 435 STACK_BIAS), 436 sizeof(struct reg_window)); 437 } else { 438 struct reg_window *rp; 439 440 rp = ¤t_thread_info()->reg_window[wsaved - 1]; 441 err |= copy_to_user(sf, rp, sizeof(struct reg_window)); 442 } 443 if (info) 444 err |= copy_siginfo_to_user(&sf->info, info); 445 else { 446 err |= __put_user(signo, &sf->info.si_signo); 447 err |= __put_user(SI_NOINFO, &sf->info.si_code); 448 } 449 if (err) 450 goto sigsegv; 451 452 /* 3. signal handler back-trampoline and parameters */ 453 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; 454 regs->u_regs[UREG_I0] = signo; 455 regs->u_regs[UREG_I1] = (unsigned long) &sf->info; 456 457 /* The sigcontext is passed in this way because of how it 458 * is defined in GLIBC's /usr/include/bits/sigcontext.h 459 * for sparc64. It includes the 128 bytes of siginfo_t. 460 */ 461 regs->u_regs[UREG_I2] = (unsigned long) &sf->info; 462 463 /* 5. signal handler */ 464 regs->tpc = (unsigned long) ka->sa.sa_handler; 465 regs->tnpc = (regs->tpc + 4); 466 if (test_thread_flag(TIF_32BIT)) { 467 regs->tpc &= 0xffffffff; 468 regs->tnpc &= 0xffffffff; 469 } 470 /* 4. return to kernel instructions */ 471 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; 472 return 0; 473 474 sigill: 475 do_exit(SIGILL); 476 return -EINVAL; 477 478 sigsegv: 479 force_sigsegv(signo, current); 480 return -EFAULT; 481 } 482 483 static inline int handle_signal(unsigned long signr, struct k_sigaction *ka, 484 siginfo_t *info, 485 sigset_t *oldset, struct pt_regs *regs) 486 { 487 int err; 488 489 err = setup_rt_frame(ka, regs, signr, oldset, 490 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); 491 if (err) 492 return err; 493 spin_lock_irq(¤t->sighand->siglock); 494 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); 495 if (!(ka->sa.sa_flags & SA_NOMASK)) 496 sigaddset(¤t->blocked,signr); 497 recalc_sigpending(); 498 spin_unlock_irq(¤t->sighand->siglock); 499 500 tracehook_signal_handler(signr, info, ka, regs, 0); 501 502 return 0; 503 } 504 505 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, 506 struct sigaction *sa) 507 { 508 switch (regs->u_regs[UREG_I0]) { 509 case ERESTART_RESTARTBLOCK: 510 case ERESTARTNOHAND: 511 no_system_call_restart: 512 regs->u_regs[UREG_I0] = EINTR; 513 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); 514 break; 515 case ERESTARTSYS: 516 if (!(sa->sa_flags & SA_RESTART)) 517 goto no_system_call_restart; 518 /* fallthrough */ 519 case ERESTARTNOINTR: 520 regs->u_regs[UREG_I0] = orig_i0; 521 regs->tpc -= 4; 522 regs->tnpc -= 4; 523 } 524 } 525 526 /* Note that 'init' is a special process: it doesn't get signals it doesn't 527 * want to handle. Thus you cannot kill init even with a SIGKILL even by 528 * mistake. 529 */ 530 static void do_signal(struct pt_regs *regs, unsigned long orig_i0) 531 { 532 struct k_sigaction ka; 533 int restart_syscall; 534 sigset_t *oldset; 535 siginfo_t info; 536 int signr; 537 538 if (pt_regs_is_syscall(regs) && 539 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { 540 restart_syscall = 1; 541 } else 542 restart_syscall = 0; 543 544 if (current_thread_info()->status & TS_RESTORE_SIGMASK) 545 oldset = ¤t->saved_sigmask; 546 else 547 oldset = ¤t->blocked; 548 549 #ifdef CONFIG_COMPAT 550 if (test_thread_flag(TIF_32BIT)) { 551 extern void do_signal32(sigset_t *, struct pt_regs *, 552 int restart_syscall, 553 unsigned long orig_i0); 554 do_signal32(oldset, regs, restart_syscall, orig_i0); 555 return; 556 } 557 #endif 558 559 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 560 561 /* If the debugger messes with the program counter, it clears 562 * the software "in syscall" bit, directing us to not perform 563 * a syscall restart. 564 */ 565 if (restart_syscall && !pt_regs_is_syscall(regs)) 566 restart_syscall = 0; 567 568 if (signr > 0) { 569 if (restart_syscall) 570 syscall_restart(orig_i0, regs, &ka.sa); 571 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { 572 /* A signal was successfully delivered; the saved 573 * sigmask will have been stored in the signal frame, 574 * and will be restored by sigreturn, so we can simply 575 * clear the TS_RESTORE_SIGMASK flag. 576 */ 577 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 578 } 579 return; 580 } 581 if (restart_syscall && 582 (regs->u_regs[UREG_I0] == ERESTARTNOHAND || 583 regs->u_regs[UREG_I0] == ERESTARTSYS || 584 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { 585 /* replay the system call when we are done */ 586 regs->u_regs[UREG_I0] = orig_i0; 587 regs->tpc -= 4; 588 regs->tnpc -= 4; 589 pt_regs_clear_syscall(regs); 590 } 591 if (restart_syscall && 592 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { 593 regs->u_regs[UREG_G1] = __NR_restart_syscall; 594 regs->tpc -= 4; 595 regs->tnpc -= 4; 596 pt_regs_clear_syscall(regs); 597 } 598 599 /* If there's no signal to deliver, we just put the saved sigmask 600 * back 601 */ 602 if (current_thread_info()->status & TS_RESTORE_SIGMASK) { 603 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 604 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); 605 } 606 } 607 608 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) 609 { 610 if (thread_info_flags & _TIF_SIGPENDING) 611 do_signal(regs, orig_i0); 612 if (thread_info_flags & _TIF_NOTIFY_RESUME) { 613 clear_thread_flag(TIF_NOTIFY_RESUME); 614 tracehook_notify_resume(regs); 615 if (current->replacement_session_keyring) 616 key_replace_session_keyring(); 617 } 618 } 619 620