Correct. Once you successfully cast to a function pointer, the compiled code will do all of the various register bookkeeping for stack management, then jump to

Correct. Once you successfully cast to a function pointer, the compiled code will do all of the various register bookkeeping for stack management, then jump to the instruction specified. If it's legit assembly, then you're in business. If it's not, then you probably crash. It doesn't matter whether the instructions are the garden variety compiler-generated kind or some hand-crafted artisanal limited edition bytes. Instructions are instructions at that point.