quit_request is for internal use. This means the IP register was updated and qemu needs to rebuild the translation blocks. stop_request is set by the user (uc_emu_stop) to indecate that unicorn sould stop emulating.
code under arm/ is from arm-softmmu/target/arm/*.inc.c code under aarch64/ is from aarch64-softmmu/target/aarch64/*.inc.c WARNING: these code are autogen from scripts/decodetree.py, DO NOT modify them.