Copy unwind.js into your PJ64 Scripts folder unwind.dll into Scripts/modules. Modify the elf_path variable in unwind.js to point to the ELF file for the current ROM and run it from the PJ64 scripts menu. Debugging and interpreter mode must both be enabled in PJ64 for this tool to work correctly.
Requires make, clang, and visual studio installed. Make sure the first two are on your path, then run make from Visual Studio Developer Command Prompt. Better build instructions coming soon.