46 lines
1.2 KiB
NASM
46 lines
1.2 KiB
NASM
section .data
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file_path db '/ebalo/huy.txt', 0 ; File path
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message db 'Hello, World from KatauOS!', 10, 0 ; Message with newline
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message_len equ $ - message - 1 ; Length excluding null terminator
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section .bss
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buffer resb 256 ; Buffer for reading file content
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read_count resd 1 ; Store bytes read count
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section .text
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global _start
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_start:
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; Reopen file for reading
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mov eax, 5 ; sys_open
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mov ebx, file_path
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mov ecx, 0 ; O_RDONLY
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mov edx, 0 ; Mode (unused)
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int 0x80
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mov edi, eax ; Save new descriptor
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; Read file content
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mov eax, 3 ; sys_read
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mov ebx, edi
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mov ecx, buffer
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mov edx, 256
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int 0x80
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mov [read_count], eax ; Save bytes read count
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; Write to stdout
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mov eax, 4 ; sys_write
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mov ebx, 1 ; stdout
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mov ecx, buffer
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mov edx, [read_count] ; Use actual bytes read
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int 0x80
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; Close file
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mov eax, 6 ; sys_close
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mov ebx, edi
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int 0x80
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; Exit
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mov eax, 1 ; sys_exit
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xor ebx, ebx ; Return 0
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int 0x80
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