56 lines
1.1 KiB
ArmAsm
56 lines
1.1 KiB
ArmAsm
; ___ ___ _____ ___ ___ __ ___ ___ ___ ___
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; | _ \ __|_ _| _ \/ _ \ / / | __| _ ___ ___| _ ) __| \
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; | / _| | | | / (_) | / / | _| '_/ -_) -_) _ \__ \ |) |
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; |_|_\___| |_| |_|_\\___/ /_/ |_||_| \___\___|___/___/___/
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;
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; This is the minimal startup + I/O functionality needed to run
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; RETRO on a FreeBSD x86 system.
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; =============================================================
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bits 32
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section .text
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global putchar
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global getchar
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global _start
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extern main
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align 4
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_start:
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call main
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jmp $
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align 4
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putchar:
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mov eax, [esp+4]
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mov [buf], eax
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push dword 1
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push dword buf
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push dword 1
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mov eax, 4
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call kernel
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add esp, 12
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ret
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align 4
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getchar:
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push dword 1
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push dword buf
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push dword 0
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mov eax, 3
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call kernel
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add esp, 12
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mov eax, 0
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mov eax, [buf]
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ret
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align 4
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kernel:
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int 80h
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ret
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section .data
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buf:
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dd 0
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dd 0
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dd 0
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dd 0
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