Modifying QEMU for Basic Instrumentation

In this chapter, we will see how to adapt QEMU and use Avatar2 and PANDA (an ad-hoc version of QEMU that interfaces nicely with Avatar2) to add a new architecture (https://i.blackhat.com/USA-20/Wednesday/us-20-Hernandez-Emulating-Samsungs-Baseband-For-Security-Testing.pdf). Also part of this work was explored by Marina Caro and Ádrian Hacar Sobrino in their BSc final projects. We will describe a basic process to add a new central processing unit (CPU) to QEMU and start to see some universal asynchronous receiver-transmitter (UART) output. We will add a CPU and check some UART output of an unknown (a baseband firmware) because such CPU and peripherals are the basics to develop an emulator for a real-time baseband firmware based on ARM Cortex-R (R stands for real-time). Then we will explore the work cited previously, which has methodologically made an effort to fuzz specifically baseband firmware. Nonetheless, the surface for basebands is...