ABI, which calling conventions are one part of, only affects how different pieces of code within the operating system talk to each other. It’s not uncommon to

ABI, which calling conventions are one part of, only affects how different pieces of code within the operating system talk to each other. It’s not uncommon to customize it - for instance, Windows does too. [1] Having a custom ABI does not present any obstacle to emulation. The rest of what you said is right, though. [1] https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=msvc-170 https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi...