LXR linux/arch/sparc/kernel/signal

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