func: void alpha_cpu_unassigned_access(CPUState *cs, hwaddr addr,
  
                                   bool is_write, bool is_exec, int unused,
  
                                   unsigned size)
  
  {
  
      AlphaCPU *cpu = ALPHA_CPU(cs);
  
      CPUAlphaState *env = &cpu->env;
  
  
  
      env->trap_arg0 = addr;
  
      env->trap_arg1 = is_write ? 1 : 0;
  
      dynamic_excp(env, 0, EXCP_MCHK, 0);
  
  }
  