Assembly Primer for Hackers (Part 10) Functions

This is Part 10 of the "Assembly Language Primer for Hackers" video series. Please start here by watching Part 1 of this series, if you have not already done so. In this video we will look at how to write functions in Assembly Language.

The most important step in writing functions in assembly is to understand how to pass arguments to them and then read their return values. We will look at 2 techniques - using registers and using global memory locations to understand how this can be done. In this demo we will use our familiar "Hello World" program to demonstrate how to code a simple function using the "write()" syscall. We will use  the Function.s program to demonstrate argument passing using the CPU registers and Function2.s to demo argument passing using global memory location in the .BSS segment.

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Vivek Ramachandran is a security evangelist and has been working in computer security related fields for the past 7 years. In 2007, Vivek spoke at world renowned conferences Defcon (WEP Cloaking Exposed) and Toorcon (The Caffe Latte Attack). The discovery of the Caffe Latte Attack was covered by CBS5 news, BBC online, Network World etc news agencies.In 2006, Vivek was announced as one of winners of the Microsoft Security Shootout contest held in India among 65,000 participants. He has also been a recipient of a Team Achievement at Cisco Systems for his work on 802.1x and Port Security modules on the Catalyst 6500 switches. Currently he spends all of his time maintaining Security- Freak.Net , SecurityTube.Net and is the co-founder of Axonize. Vivek, is a Bachelor in Electronics and Communications Engineering from the prestigious Indian Institute of Technology, Guwahati.You can contact him at vivek[at]securitytube.net