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Introduction to x86 assembly
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file_operations.asm
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ClementColmerauer
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at 2024-10-20 09:30:55
file_operations.asm
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global _start section .data message: db "GWAK !", 10 filename: db "file.txt", 0 fd: dw 0 buffer: dw 0 section .text _start: call open_wo call write call close call open_ro call read call print call close mov eax, 1 xor ebx, ebx int 80h open_wo: mov eax, 5 mov ebx, filename mov ecx, 0101q mov edx, 0666q int 80h mov [fd], eax ret open_ro: mov eax, 5 mov ebx, filename mov ecx, 0102q mov edx, 0666q int 80h mov [fd], eax ret write: mov eax, 4 mov ebx, [fd] mov ecx, message mov edx, 7 int 80h ret read: mov eax, 3 mov ebx, [fd] mov ecx, [buffer] mov edx, 7 int 80h ret print: mov eax, 4 mov ebx, 1 mov ecx, byte [buffer] mov edx, 7 int 80h ret close: mov eax, 6 mov ebx, [fd] int 80h ret
