This project is a custom emulator/VM, along with tooling such as an assembler, disassembler, and integrated debugger. It was originally written as a challenge for a CTF run by my school's computer security club. It has been refactored and reorganized. In the future, I _may_ reuse this challenge and modify it, mainly so that it cannot be unintentionally autosolved by the angr framework (as it was in its original form).
For documentation on the assembly language and architecture, consult the relevant file(s) in `doc/`.
* Note: in-between making the normal and trace images, one should run `make cleano` to remove previous object files since they'll differ between normal and trace builds
To use the debugger, simply build and run the trace image, as the binary will automatically place you in the debugger to start.
The assembler, `ass.sh`, can be used to create a binary ROM image given an assembly language file (file extension `.asm`) and an optional zero page initialization file (`zeropage.incbin` in the challenge's case). The latter if present, is used to initialize the first 256 bytes of ROM to some hardcoded state.
