code: func fillnop(p []uint8, n int) {
  	var m int
  	for n > 0 {
  		m = n
  		if m > len(nop) {
  			m = len(nop)
  		}
  		copy(p, nop[m-1][:m])
  		p = p[m:]
  		n -= m
  	}
  }
docs: // Native Client rejects the repeated 0x66 prefix.
  // {0x66, 0x66, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00},