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author | Kartik Agaram <vc@akkartik.com> | 2020-01-01 16:35:02 -0800 |
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committer | Kartik Agaram <vc@akkartik.com> | 2020-01-01 16:35:02 -0800 |
commit | 7ca19e4e1d3acb2c770c180156b813fb536a673e (patch) | |
tree | 35ad8c7dfd1a09326b747363a4a5ec61fe4484ac /mu-init.subx | |
parent | dafef4e30fcfb53e6546ce0f53859bf9f1420dd2 (diff) | |
download | mu-7ca19e4e1d3acb2c770c180156b813fb536a673e.tar.gz |
5850 - driver script for translating Mu programs
Diffstat (limited to 'mu-init.subx')
-rw-r--r-- | mu-init.subx | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/mu-init.subx b/mu-init.subx new file mode 100644 index 00000000..0c5d0293 --- /dev/null +++ b/mu-init.subx @@ -0,0 +1,25 @@ +# Initialize the minimal runtime for Mu programs. +# +# See translate_mu for how this file is used. +# +# Mu programs start at a function called 'main' with this signature: +# fn main args: (address array kernel-string) -> exit_status/ebx : int +# If your program doesn't need commandline arguments you can drop it: +# fn main -> exit_status/ebx : int +# +# Notice that the output must be in ebx, so that the exit() syscall can pick +# it up. + +== code + +Entry: + # we don't use ebp in Entry; just initialize it + bd/copy-to-ebp 0/imm32 + # var args/eax : (address array kernel-string) + 89/<- %eax 4/r32/esp + # initialize the heap + (new-segment *Heap-size Heap) + # run Mu program + (main %eax) + # exit + (syscall_exit) |