https://github.com/akkartik/mu/blob/main/linux/102test.subx 
  1 # Rudimentary test harness
  2 
  3 == code
  4 #   instruction                     effective address                                                   register    displacement    immediate
  5 # . op          subop               mod             rm32          base        index         scale       r32
  6 # . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes
  7 
  8 Entry:  # manual test
  9     # check-ints-equal(34, 34)
 10     # . . push args
 11     68/push  "error in check-ints-equal"/imm32
 12     68/push  34/imm32
 13     68/push  34/imm32
 14     # . . call
 15     e8/call  check-ints-equal/disp32
 16     # . . discard args
 17     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
 18     # syscall(exit, 0)
 19     bb/copy-to-ebx  0/imm32
 20     e8/call  syscall_exit/disp32
 21
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