Update! I got a chance to look at the European release of ICO, and pretty much immediately noticed the new files SRCFILE.TXT and TRFILE.TXT. SRCFILE is the complete 'objdump -d' output of the game, with the debugging line numbers, and TRFILE is the complete linker log. Which includes these function names: 00136cc0:0003215616:0710:ffff:huft_build():fumi/ios/inflate.c:119 00137488:0003244212:0160:ff