Intro to Assembly Language: Lecture Notes

NASM Coding: Basics

A quick summary of the files we will work with and common syscalls:

File	ID	Description	Use
`stdin`	`0`	Keyboard	Input
`stdout`	`1`	Screen	Output
`stderr`	`2`	Screen (for printing error messages)	Output

Syscall	ID	# of Args	Description
`read`	`0`	$3$	Reading from files
`write`	`1`	$3$	Writing to files
`_exit`	`60`	$1$	Exiting the program

The full list of all the supported Linux syscalls (there are slightly over 300 such functions) and their syscall numbers are listed in this article. In the scope of this class, however, we will use only the 3 syscalls we mentioned in the summary table above.