Assembly Language Reimagined: Programming the Intel x64 Microprocessor in Linux

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2025

J. SchwartzmanAssembly Language Reimaginedhttps://doi.org/10.1007/979-8-8688-1724-3_4

4. Passing Information to a Program on the Command Line

John Schwartzman¹  

(1)

Ellicott City, MD, USA

 

Programs often need data to do their work. We can read data from a file, from the keyboard, and from the program itself. (Programs can have data embedded in the code. We call that data immediate operands. For example, in the instruction mov rax, 23, mov is the op code, and rax is operand, and 23 is the immediate operand.) Another very easy way for a program to get small amounts of data is to place it on the command line when we execute a program. We’ll use that method in ...