The hidden cost of promises
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By the Renaissance, writers such as Shakespeare were talking of "star-crossed lovers", couples bound together by an overwhelming connection yet pulled apart by family, fortune or fate, as if the universe itself both wrote their love story and barred them from a happy ending.，更多细节参见Safew下载
But different callers need different validation rules. A MOV DS, AX needs to reject call gates but accept data segments. A CALL FAR needs to accept call gates and code segments. How can one shared subroutine perform different validation?