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signal.c

/*
 *  arch/sparc64/kernel/signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
 *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
 *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
 */

#ifdef CONFIG_COMPAT
#include <linux/compat.h>     /* for compat_old_sigset_t */
#endif
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/unistd.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/bitops.h>

#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/pgtable.h>
#include <asm/fpumacro.h>
#include <asm/uctx.h>
#include <asm/siginfo.h>
#include <asm/visasm.h>

#include "entry.h"
#include "systbls.h"

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

/* {set, get}context() needed for 64-bit SparcLinux userland. */
asmlinkage void sparc64_set_context(struct pt_regs *regs)
{
      struct ucontext __user *ucp = (struct ucontext __user *)
            regs->u_regs[UREG_I0];
      mc_gregset_t __user *grp;
      unsigned long pc, npc, tstate;
      unsigned long fp, i7;
      unsigned char fenab;
      int err;

      flush_user_windows();
      if (get_thread_wsaved()                         ||
          (((unsigned long)ucp) & (sizeof(unsigned long)-1))      ||
          (!__access_ok(ucp, sizeof(*ucp))))
            goto do_sigsegv;
      grp  = &ucp->uc_mcontext.mc_gregs;
      err  = __get_user(pc, &((*grp)[MC_PC]));
      err |= __get_user(npc, &((*grp)[MC_NPC]));
      if (err || ((pc | npc) & 3))
            goto do_sigsegv;
      if (regs->u_regs[UREG_I1]) {
            sigset_t set;

            if (_NSIG_WORDS == 1) {
                  if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
                        goto do_sigsegv;
            } else {
                  if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
                        goto do_sigsegv;
            }
            sigdelsetmask(&set, ~_BLOCKABLE);
            spin_lock_irq(&current->sighand->siglock);
            current->blocked = set;
            recalc_sigpending();
            spin_unlock_irq(&current->sighand->siglock);
      }
      if (test_thread_flag(TIF_32BIT)) {
            pc &= 0xffffffff;
            npc &= 0xffffffff;
      }
      regs->tpc = pc;
      regs->tnpc = npc;
      err |= __get_user(regs->y, &((*grp)[MC_Y]));
      err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
      regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
      regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
      err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
      err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
      err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
      err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
      err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
      err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));

      /* Skip %g7 as that's the thread register in userspace.  */

      err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
      err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
      err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
      err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
      err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
      err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
      err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
      err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));

      err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
      err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
      err |= __put_user(fp,
            (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
      err |= __put_user(i7,
            (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));

      err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
      if (fenab) {
            unsigned long *fpregs = current_thread_info()->fpregs;
            unsigned long fprs;
            
            fprs_write(0);
            err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
            if (fprs & FPRS_DL)
                  err |= copy_from_user(fpregs,
                                    &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
                                    (sizeof(unsigned int) * 32));
            if (fprs & FPRS_DU)
                  err |= copy_from_user(fpregs+16,
                   ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
                   (sizeof(unsigned int) * 32));
            err |= __get_user(current_thread_info()->xfsr[0],
                          &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
            err |= __get_user(current_thread_info()->gsr[0],
                          &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
            regs->tstate &= ~TSTATE_PEF;
      }
      if (err)
            goto do_sigsegv;

      return;
do_sigsegv:
      force_sig(SIGSEGV, current);
}

asmlinkage void sparc64_get_context(struct pt_regs *regs)
{
      struct ucontext __user *ucp = (struct ucontext __user *)
            regs->u_regs[UREG_I0];
      mc_gregset_t __user *grp;
      mcontext_t __user *mcp;
      unsigned long fp, i7;
      unsigned char fenab;
      int err;

      synchronize_user_stack();
      if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
            goto do_sigsegv;

#if 1
      fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
#else
      fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
#endif
            
      mcp = &ucp->uc_mcontext;
      grp = &mcp->mc_gregs;

      /* Skip over the trap instruction, first. */
      if (test_thread_flag(TIF_32BIT)) {
            regs->tpc   = (regs->tnpc & 0xffffffff);
            regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
      } else {
            regs->tpc   = regs->tnpc;
            regs->tnpc += 4;
      }
      err = 0;
      if (_NSIG_WORDS == 1)
            err |= __put_user(current->blocked.sig[0],
                          (unsigned long __user *)&ucp->uc_sigmask);
      else
            err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
                              sizeof(sigset_t));

      err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
      err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
      err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
      err |= __put_user(regs->y, &((*grp)[MC_Y]));
      err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
      err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
      err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
      err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
      err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
      err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
      err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
      err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
      err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
      err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
      err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
      err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
      err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
      err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
      err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));

      err |= __get_user(fp,
             (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
      err |= __get_user(i7,
             (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
      err |= __put_user(fp, &(mcp->mc_fp));
      err |= __put_user(i7, &(mcp->mc_i7));

      err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
      if (fenab) {
            unsigned long *fpregs = current_thread_info()->fpregs;
            unsigned long fprs;
            
            fprs = current_thread_info()->fpsaved[0];
            if (fprs & FPRS_DL)
                  err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
                                  (sizeof(unsigned int) * 32));
            if (fprs & FPRS_DU)
                  err |= copy_to_user(
                          ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
                    (sizeof(unsigned int) * 32));
            err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
            err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
            err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
      }
      if (err)
            goto do_sigsegv;

      return;
do_sigsegv:
      force_sig(SIGSEGV, current);
}

struct rt_signal_frame {
      struct sparc_stackf     ss;
      siginfo_t         info;
      struct pt_regs          regs;
      __siginfo_fpu_t __user  *fpu_save;
      stack_t                 stack;
      sigset_t          mask;
      __siginfo_fpu_t         fpu_state;
};

static long _sigpause_common(old_sigset_t set)
{
      set &= _BLOCKABLE;
      spin_lock_irq(&current->sighand->siglock);
      current->saved_sigmask = current->blocked;
      siginitset(&current->blocked, set);
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);

      current->state = TASK_INTERRUPTIBLE;
      schedule();

      set_restore_sigmask();

      return -ERESTARTNOHAND;
}

asmlinkage long sys_sigpause(unsigned int set)
{
      return _sigpause_common(set);
}

asmlinkage long sys_sigsuspend(old_sigset_t set)
{
      return _sigpause_common(set);
}

static inline int
restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
      unsigned long *fpregs = current_thread_info()->fpregs;
      unsigned long fprs;
      int err;

      err = __get_user(fprs, &fpu->si_fprs);
      fprs_write(0);
      regs->tstate &= ~TSTATE_PEF;
      if (fprs & FPRS_DL)
            err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
                               (sizeof(unsigned int) * 32));
      if (fprs & FPRS_DU)
            err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
                               (sizeof(unsigned int) * 32));
      err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
      err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
      current_thread_info()->fpsaved[0] |= fprs;
      return err;
}

void do_rt_sigreturn(struct pt_regs *regs)
{
      struct rt_signal_frame __user *sf;
      unsigned long tpc, tnpc, tstate;
      __siginfo_fpu_t __user *fpu_save;
      sigset_t set;
      int err;

      /* Always make any pending restarted system calls return -EINTR */
      current_thread_info()->restart_block.fn = do_no_restart_syscall;

      synchronize_user_stack ();
      sf = (struct rt_signal_frame __user *)
            (regs->u_regs [UREG_FP] + STACK_BIAS);

      /* 1. Make sure we are not getting garbage from the user */
      if (((unsigned long) sf) & 3)
            goto segv;

      err = get_user(tpc, &sf->regs.tpc);
      err |= __get_user(tnpc, &sf->regs.tnpc);
      if (test_thread_flag(TIF_32BIT)) {
            tpc &= 0xffffffff;
            tnpc &= 0xffffffff;
      }
      err |= ((tpc | tnpc) & 3);

      /* 2. Restore the state */
      err |= __get_user(regs->y, &sf->regs.y);
      err |= __get_user(tstate, &sf->regs.tstate);
      err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));

      /* User can only change condition codes and %asi in %tstate. */
      regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
      regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));

      err |= __get_user(fpu_save, &sf->fpu_save);
      if (fpu_save)
            err |= restore_fpu_state(regs, &sf->fpu_state);

      err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
      err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);

      if (err)
            goto segv;

      regs->tpc = tpc;
      regs->tnpc = tnpc;

      /* Prevent syscall restart.  */
      pt_regs_clear_syscall(regs);

      sigdelsetmask(&set, ~_BLOCKABLE);
      spin_lock_irq(&current->sighand->siglock);
      current->blocked = set;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);
      return;
segv:
      force_sig(SIGSEGV, current);
}

/* Checks if the fp is valid */
static int invalid_frame_pointer(void __user *fp, int fplen)
{
      if (((unsigned long) fp) & 7)
            return 1;
      return 0;
}

static inline int
save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
      unsigned long *fpregs = current_thread_info()->fpregs;
      unsigned long fprs;
      int err = 0;
      
      fprs = current_thread_info()->fpsaved[0];
      if (fprs & FPRS_DL)
            err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
                            (sizeof(unsigned int) * 32));
      if (fprs & FPRS_DU)
            err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
                            (sizeof(unsigned int) * 32));
      err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
      err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
      err |= __put_user(fprs, &fpu->si_fprs);

      return err;
}

static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
{
      unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;

      /*
       * If we are on the alternate signal stack and would overflow it, don't.
       * Return an always-bogus address instead so we will die with SIGSEGV.
       */
      if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
            return (void __user *) -1L;

      /* This is the X/Open sanctioned signal stack switching.  */
      if (ka->sa.sa_flags & SA_ONSTACK) {
            if (sas_ss_flags(sp) == 0)
                  sp = current->sas_ss_sp + current->sas_ss_size;
      }

      /* Always align the stack frame.  This handles two cases.  First,
       * sigaltstack need not be mindful of platform specific stack
       * alignment.  Second, if we took this signal because the stack
       * is not aligned properly, we'd like to take the signal cleanly
       * and report that.
       */
      sp &= ~7UL;

      return (void __user *)(sp - framesize);
}

static inline void
setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
             int signo, sigset_t *oldset, siginfo_t *info)
{
      struct rt_signal_frame __user *sf;
      int sigframe_size, err;

      /* 1. Make sure everything is clean */
      synchronize_user_stack();
      save_and_clear_fpu();
      
      sigframe_size = sizeof(struct rt_signal_frame);
      if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
            sigframe_size -= sizeof(__siginfo_fpu_t);

      sf = (struct rt_signal_frame __user *)
            get_sigframe(ka, regs, sigframe_size);
      
      if (invalid_frame_pointer (sf, sigframe_size))
            goto sigill;

      if (get_thread_wsaved() != 0)
            goto sigill;

      /* 2. Save the current process state */
      err = copy_to_user(&sf->regs, regs, sizeof (*regs));

      if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
            err |= save_fpu_state(regs, &sf->fpu_state);
            err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
      } else {
            err |= __put_user(0, &sf->fpu_save);
      }
      
      /* Setup sigaltstack */
      err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
      err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
      err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);

      err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));

      err |= copy_in_user((u64 __user *)sf,
                      (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
                      sizeof(struct reg_window));

      if (info)
            err |= copy_siginfo_to_user(&sf->info, info);
      else {
            err |= __put_user(signo, &sf->info.si_signo);
            err |= __put_user(SI_NOINFO, &sf->info.si_code);
      }
      if (err)
            goto sigsegv;
      
      /* 3. signal handler back-trampoline and parameters */
      regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
      regs->u_regs[UREG_I0] = signo;
      regs->u_regs[UREG_I1] = (unsigned long) &sf->info;

      /* The sigcontext is passed in this way because of how it
       * is defined in GLIBC's /usr/include/bits/sigcontext.h
       * for sparc64.  It includes the 128 bytes of siginfo_t.
       */
      regs->u_regs[UREG_I2] = (unsigned long) &sf->info;

      /* 5. signal handler */
      regs->tpc = (unsigned long) ka->sa.sa_handler;
      regs->tnpc = (regs->tpc + 4);
      if (test_thread_flag(TIF_32BIT)) {
            regs->tpc &= 0xffffffff;
            regs->tnpc &= 0xffffffff;
      }
      /* 4. return to kernel instructions */
      regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
      return;

sigill:
      do_exit(SIGILL);
sigsegv:
      force_sigsegv(signo, current);
}

static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
                         siginfo_t *info,
                         sigset_t *oldset, struct pt_regs *regs)
{
      setup_rt_frame(ka, regs, signr, oldset,
                   (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
      spin_lock_irq(&current->sighand->siglock);
      sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
      if (!(ka->sa.sa_flags & SA_NOMASK))
            sigaddset(&current->blocked,signr);
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);
}

static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
                           struct sigaction *sa)
{
      switch (regs->u_regs[UREG_I0]) {
      case ERESTART_RESTARTBLOCK:
      case ERESTARTNOHAND:
      no_system_call_restart:
            regs->u_regs[UREG_I0] = EINTR;
            regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
            break;
      case ERESTARTSYS:
            if (!(sa->sa_flags & SA_RESTART))
                  goto no_system_call_restart;
            /* fallthrough */
      case ERESTARTNOINTR:
            regs->u_regs[UREG_I0] = orig_i0;
            regs->tpc -= 4;
            regs->tnpc -= 4;
      }
}

/* Note that 'init' is a special process: it doesn't get signals it doesn't
 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 * mistake.
 */
static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
{
      struct k_sigaction ka;
      int restart_syscall;
      sigset_t *oldset;
      siginfo_t info;
      int signr;
      
      if (pt_regs_is_syscall(regs) &&
          (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
            restart_syscall = 1;
      } else
            restart_syscall = 0;

      if (current_thread_info()->status & TS_RESTORE_SIGMASK)
            oldset = &current->saved_sigmask;
      else
            oldset = &current->blocked;

#ifdef CONFIG_COMPAT
      if (test_thread_flag(TIF_32BIT)) {
            extern void do_signal32(sigset_t *, struct pt_regs *,
                              int restart_syscall,
                              unsigned long orig_i0);
            do_signal32(oldset, regs, restart_syscall, orig_i0);
            return;
      }
#endif      

      signr = get_signal_to_deliver(&info, &ka, regs, NULL);

      /* If the debugger messes with the program counter, it clears
       * the software "in syscall" bit, directing us to not perform
       * a syscall restart.
       */
      if (restart_syscall && !pt_regs_is_syscall(regs))
            restart_syscall = 0;

      if (signr > 0) {
            if (restart_syscall)
                  syscall_restart(orig_i0, regs, &ka.sa);
            handle_signal(signr, &ka, &info, oldset, regs);

            /* A signal was successfully delivered; the saved
             * sigmask will have been stored in the signal frame,
             * and will be restored by sigreturn, so we can simply
             * clear the TS_RESTORE_SIGMASK flag.
             */
            current_thread_info()->status &= ~TS_RESTORE_SIGMASK;

            tracehook_signal_handler(signr, &info, &ka, regs, 0);
            return;
      }
      if (restart_syscall &&
          (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
           regs->u_regs[UREG_I0] == ERESTARTSYS ||
           regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
            /* replay the system call when we are done */
            regs->u_regs[UREG_I0] = orig_i0;
            regs->tpc -= 4;
            regs->tnpc -= 4;
      }
      if (restart_syscall &&
          regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
            regs->u_regs[UREG_G1] = __NR_restart_syscall;
            regs->tpc -= 4;
            regs->tnpc -= 4;
      }

      /* If there's no signal to deliver, we just put the saved sigmask
       * back
       */
      if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
            current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
            sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
      }
}

void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
{
      if (thread_info_flags & _TIF_SIGPENDING)
            do_signal(regs, orig_i0);
      if (thread_info_flags & _TIF_NOTIFY_RESUME) {
            clear_thread_flag(TIF_NOTIFY_RESUME);
            tracehook_notify_resume(regs);
      }
}

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