fox33: A WIP fox32 emulator written in c3

[!NOTE] It is recommended to build in a nix environment:

$ nix develop --impure

[!WARNING] This project is an example of what happens when you use too many macros, don't do what I did and your code will be so much more maintainable

todo:

• [x] Fix that 0x04000000 bug (so painful :()
• [x] Run fox32rom successfully
• [x] Initial Gui & see fox32rom framebuffer
• [x] Implement Gui overlays
• [x] I/O stuff:
  • [x] mounting disks
  • [x] mouse
  • [x] keyboard
  • [x] rtc
• [x] Interrupts/Exceptions
• [x] boot fox32os
• [x] Get fox32rom functioning completely
• [x] Get fox32os functioning completely
  • [ ] get all fox32os apps functioning (only missing some simple instructions)
• [ ] Implement all instructions fully
• [ ] MMU
• [ ] swap sp so I can run minita
• [ ] internal refactoring of error handling
• [ ] refactor convenience macros to be more convenient & less awfully hacky (they will bever be entirely hack free tho (cry about my overuse of macros lerno >:3))
• [ ] implement audio
• [ ] make clock rate stable at 33Mhz & make vsync consistently timed
• [ ] Any other things I can think of

building:

$ c3c build -D <build flag> -O5

build flags:

• DEBUG -> print almost too many debug logs
• PERF -> print the time taken to execute 30M instructions (target <= 1 second for 30Mhz)
• NOWARN -> silence runtime warnings, mostly unimplemented methods
• FOXLOG -> print debug logs in the exact same format as the fox32 reference emulator
• MORE_PERF -> inlines all instructions for a performance boost at the cost of compile-time

usage:

$ ./build/fox33 <boot rom> <disk0> <disk1> <disk2> <disk3> <index out of bounds error>