mkdir.S

.global mkdir
mkdir:
  // Move mode into x2
  mov x2, x1
  // Move dirname ptr into x1
  mov x1, x0
  // Obtain FD for x0 (I have no clue what magic this is) 
  mov x0, #-0x64
  // Syscall 34 = mkdirat
  mov x8, #34
  // Call syscall
  svc #0

  // exit() with code from mkdirat syscall
  mov     x8, #93
  svc     #0