Add your function in a .sym file in the Symbols folder, in this format:

_Z8functionv,ADDRESS,FUNCTIONSIZE,STATUS

Note that the base of ADDRESS is at 0x00100000

STATUS can be 4 things:

• O: OK
  • The function is matching
• m: Minor problems
  • The function is mismatching with the same size as the original
• M: Major problems
  • The function is mismatching with a different size than the original
• U: Undecompiled
  • The function is not defined

You don't have to input STATUS manually, 'Tools/check.py' will automatically rank it for you, so just use 'U' when adding new functions.

Your function should now be placed in a .cpp file that is equivalent to the symbol file path, e.g. 'Path/To/Object.sym' → 'Path/To/Object.cpp'

Once you have the function, build the project and run the 'Tools/diff.py' script with your symbol to find any mismatching problems. If you are done with the function, run the check script.

If your function is not marked as OK, wrap it in an '#ifdef NON_MATCHING', and explain which part of the function is mismatching in a comment, if you can.

(note: if you add a .cpp file, you will have to modify/touch the CMakeLists.txt file for it to compile the new .cpp file)