Web Reference: Jan 16, 2026 · This cheatsheet demystifies the int 0x80 interface, providing a quick reference for system call numbers, register usage, and practical examples to help you write assembly code with confidence. System calls are APIs for the interface between the user space and the kernel space. We have already used the system calls. sys_write and sys_exit, for writing into the screen and exiting from the program, respectively. You can make use of Linux system calls in your assembly programs. Since the tables are hand maintained in our kernel (and not upstream), new syscalls aren't added to the list automatically, so you might see confusing errors like ENOSYS, but only when run inside of the container.
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