I was fascinated with debuggers a while back exactly because they were so mysterious to me. I then wrote a ptrace debugger myself [1]. It features pretty simple implementations of the most common stuff you would expect in a debugger. Though I made the grave mistake of formatting all the code in GNU style.
https://blog.tartanllama.xyz/writing-a-linux-debugger-setup/
Eli Bendersky also wrote about debuggers (I think his post is a great place to start):
https://eli.thegreenplace.net/2011/01/23/how-debuggers-work-...
I was fascinated with debuggers a while back exactly because they were so mysterious to me. I then wrote a ptrace debugger myself [1]. It features pretty simple implementations of the most common stuff you would expect in a debugger. Though I made the grave mistake of formatting all the code in GNU style.
[1]: https://github.com/thass0/spray/tree/main/src