This post delves into the world of x86 and amd64 emulation, showcasing various intriguing facts learned while working on a CPU emulator for Time Travel Debugging. The evolution from assembly code to C++ for enhancing maintainability and performance is highlighted. The intricate details of x86 encoding and instruction quirks are explored, shedding light on the nuances of shift instructions, flag behaviors, and segment overrides. The post also touches on fascinating tidbits like the use of prefixes and the impact of CPU configurations on segment registers. Overall, a captivating insight into the inner workings of CPUs through the lens of emulation.
https://www.timdbg.com/posts/useless-x86-trivia/