code: function get_registers(cpu) {
    cpu = cpu.toLowerCase();
  
    if (cpu.startsWith('arm')) {
      return REGISTERS.ARM;
    }
  
    if (~[ 'x86', 'i386', 'i486', 'i686' ].indexOf(cpu)) {
      return REGISTERS.X86;
    }
  
    if (cpu === 'x86_64') {
      return REGISTERS.X86_64;
    }
  
    return [];
  }
docs: Returns an array of registers associated with
  a given CPU arch.
  
  @param cpu the CPU arch.
  @returns {Array} an array of registers.