Modules are generated by the gen-modules tool. This tool takes the vita-headers NID database file db.yml as input, and generates:

• "Stub" (existing but unimplemented) functions corresponding to SCE module exports
• A header file to declare all the NIDs
• CMake scripts to build them

• Bypasses a lot of manual, error-prone, tedious work
• Follows coding style
• Correctness: NID mappings in line with vitasdk

• Build process is more involved
• vita-headers submodule shouldn't be updated without regenerating modules

1. Build and run gen-modules, with the current directory being src (I think, it's been a while). This will erase a bunch of stuff we want to keep.
2. Commit it. We'll undo this commit later.
3. Update vita-headers
4. Run gen-modules again. These are the changes you want to keep.
5. Interactive Rebase in git to remove the commit you made in 2.