do_signal(struct pt_regs * regs, struct switch_stack * sw,
	  unsigned long r0, unsigned long r19)
{
	siginfo_t info;
	int signr;
	unsigned long single_stepping = ptrace_cancel_bpt(current);
	struct k_sigaction ka;
	sigset_t *oldset;

	if (test_thread_flag(TIF_RESTORE_SIGMASK))
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

	/* This lets the debugger run, ... */
	signr = get_signal_to_deliver(&info, &ka, regs, NULL);

	/* ... so re-check the single stepping. */
	single_stepping |= ptrace_cancel_bpt(current);

	if (signr > 0) {
		/* Whee!  Actually deliver the signal.  */
		if (r0)
			syscall_restart(r0, r19, regs, &ka);
		if (handle_signal(signr, &ka, &info, oldset, regs, sw) == 0) {
			/* A signal was successfully delivered, and the
			   saved sigmask was stored on the signal frame,
			   and will be restored by sigreturn.  So we can
			   simply clear the restore sigmask flag.  */
			if (test_thread_flag(TIF_RESTORE_SIGMASK))
				clear_thread_flag(TIF_RESTORE_SIGMASK);
		}
		if (single_stepping) 
			ptrace_set_bpt(current); /* re-set bpt */
		return;
	}

	if (r0) {
	  	switch (regs->r0) {
		case ERESTARTNOHAND:
		case ERESTARTSYS:
		case ERESTARTNOINTR:
			/* Reset v0 and a3 and replay syscall.  */
			regs->r0 = r0;
			regs->r19 = r19;
			regs->pc -= 4;
			break;
		case ERESTART_RESTARTBLOCK:
			/* Force v0 to the restart syscall and reply.  */
			regs->r0 = __NR_restart_syscall;
			regs->pc -= 4;
			break;
		}
	}

	/* If there's no signal to deliver, we just restore the saved mask.  */
	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
		clear_thread_flag(TIF_RESTORE_SIGMASK);
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}

	if (single_stepping)
		ptrace_set_bpt(current);	/* re-set breakpoint */
}
do_signal(struct pt_regs * regs, struct switch_stack * sw,
	  unsigned long r0, unsigned long r19)
{
	siginfo_t info;
	int signr;
	unsigned long single_stepping = ptrace_cancel_bpt(current);
	struct k_sigaction ka;
	sigset_t *oldset;

	if (test_thread_flag(TIF_RESTORE_SIGMASK))
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

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

	 
	single_stepping |= ptrace_cancel_bpt(current);

	if (signr > 0) {
		 
		if (r0)
			syscall_restart(r0, r19, regs, &ka);
		if (handle_signal(signr, &ka, &info, oldset, regs, sw) == 0) {
			 
			if (test_thread_flag(TIF_RESTORE_SIGMASK))
				clear_thread_flag(TIF_RESTORE_SIGMASK);
		}
		if (single_stepping) 
			ptrace_set_bpt(current);  
		return;
	}

	if (r0) {
	  	switch (regs->r0) {
		case ERESTARTNOHAND:
		case ERESTARTSYS:
		case ERESTARTNOINTR:
			 
			regs->r0 = r0;
			regs->r19 = r19;
			regs->pc -= 4;
			break;
		case ERESTART_RESTARTBLOCK:
			 
			regs->r0 = __NR_restart_syscall;
			regs->pc -= 4;
			break;
		}
	}

	 
	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
		clear_thread_flag(TIF_RESTORE_SIGMASK);
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}

	if (single_stepping)
		ptrace_set_bpt(current);	 
}