ROM Hack Question Game Reverse Engineering

[gudenau]

I would like to get into reversing a Switch game for the purposes of making some (hopefully) small modifications to how it works. I am unsure of the process that I would need to get the executable off of my Switch and onto my computer and into Ghidra. I would like to be able to go from some specific system calls and start adding some hooks to log things over the network as a starting point.

What would be the processes for:

• Dumping the executable from my Switch
• Load the executable into Ghidra with syscalls and services mapped, maybe even STD/Nintendo libs if possible
  
• Creating patches for the executable
• Creating a small C(++) binary for the patches to call

Just a quick example, lets say I want to patch Minecraft to log how it uses acc services. What would be the general process used to do that?

 

[masagrator]

You can't patch exefs for that. Patching means replacing data 1:1, you can't add additional instructions in between as this would break executables.

You need to inject plugin/binary to add new instructions and hooks. And for that the best is Skyline framework.

Skyline devs are available on ReSwitched discord.

 

[gudenau]

You can't patch exefs for that. Patching means replacing data 1:1, you can't add additional instructions in between as this would break executables.

You need to inject plugin/binary to add new instructions and hooks. And for that the best is Skyline framework.

Skyline devs are available on ReSwitched discord.

It's an emulator?

 

[masagrator]

It's an emulator?

https://github.com/ultimate-research/skyline-rs-template

 

[gudenau]

https://github.com/ultimate-research/skyline-rs-template

This isn't a valid answer, it uses Rust.

 

[masagrator]

This isn't a valid answer, it uses Rust.

It has also C++ equivalent, but dunno where. You would need to ask devs.