https://github.com/akkartik/mu/blob/main/319timer.subx
 1 == code
 2 
 3 timer-counter:  # -> _/eax: int
 4     # . prologue
 5     55/push-ebp
 6     89/<- %ebp 4/r32/esp
 7     #
 8     8b/-> *Timer-counter 0/r32/eax
 9 $timer-counter:end:
10     # . epilogue
11     89/<- %esp 5/r32/ebp
12     5d/pop-to-ebp
13     c3/return