func: long do_sigreturn(CPUCRISState *env)
  
  {
  
  	struct target_signal_frame *frame;
  
  	abi_ulong frame_addr;
  
  	target_sigset_t target_set;
  
  	sigset_t set;
  
  	int i;
  
  
  
  	frame_addr = env->regs[R_SP];
  
  	/* Make sure the guest isn't playing games.  */
  
  	if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1))
  
  		goto badframe;
  
  
  
  	/* Restore blocked signals */
  
  	if (__get_user(target_set.sig[0], &frame->sc.oldmask))
  
  		goto badframe;
  
  	for(i = 1; i < TARGET_NSIG_WORDS; i++) {
  
  		if (__get_user(target_set.sig[i], &frame->extramask[i - 1]))
  
  			goto badframe;
  
  	}
  
  	target_to_host_sigset_internal(&set, &target_set);
  
          do_sigprocmask(SIG_SETMASK, &set, NULL);
  
  
  
  	restore_sigcontext(&frame->sc, env);
  
  	unlock_user_struct(frame, frame_addr, 0);
  
  	return env->regs[10];
  
    badframe:
  
  	unlock_user_struct(frame, frame_addr, 0);
  
  	force_sig(TARGET_SIGSEGV);
  
  }
  