https://github.com/akkartik/mu/blob/main/mu-init.subx

     1 # Initialize the minimal runtime for Mu programs.
     2 #
     3 # See translate for how this file is used.
     4 #
     5 # Mu programs start at a function called 'main' with this signature:
     6 #   fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk)
     7 #
     8 # All tests must pass first (the "power-on unit test").
     9
    10 == code
    11
    12 Entry:
    13   # initialize stack
    14   bd/copy-to-ebp 0/imm32
    15   #
    16 #?   (main 0 0 Primary-bus-secondary-drive)
    17   # always first run tests
    18   (run-tests)
    19   (num-test-failures)  # => eax
    20   # call main if tests all passed
    21   {
    22     3d/compare-eax-and 0/imm32
    23     75/jump-if-!= break/disp8
    24     c7 0/subop/copy *Running-tests? 0/imm32/false
    25     (clear-real-screen)
    26     c7 0/subop/copy *Real-screen-cursor-x 0/imm32
    27     c7 0/subop/copy *Real-screen-cursor-y 0/imm32
    28     (main 0 0 Primary-bus-secondary-drive)
    29   }
    30
    31   # hang indefinitely
    32   {
    33     eb/jump loop/disp8
    34   }