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An IPS, IPS32 or pchtxt file for main that writes main's .rodata, .data or .bss was refused as a whole. Such writes need no lifting: tools/exefs_patches.py now puts them in build-cache/exefs.data, and runtime/mods.c stores them into the loaded main before any game code runs, as emulators and Atmosphere apply a patch file to the module before its dynamic linker runs. A DT_RELR word gets main's base added; bytes over words an explicit-addend relocation fills change nothing and are dropped; a write into the dynamic linker's tables, a lazily bound function pointer or outside main's image keeps the file unsupported. A mod whose data lines do not all fit the build keeps its code patches off too. The mods are applied from the bottom one up (mods_exefs_apply), so where two mods write the same bytes the higher one wins, as it does for files. --probe-mods checks it with two mods writing one byte. The lifted code reads some of main's bytes at lift time (the jump tables). recomp/gen.py lists those ranges in <gen>/main/folded.txt, and the setup checks the data writes against them after the lift: a file that writes them becomes unsupported, since the change would not reach the generated code. Generated C without mods is unchanged. This is the data part of #790 (ericdallo's ExeFS work), split out on its own; the plugin part follows separately. Co-Authored-By: itaskaev2 <165683571+itaskaev2@users.noreply.github.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>