更进一步，我们对于电子产品「防窥」的需求，早在十几二十年前就已经开始凸显了。
Comedian Nikki Glazer played one of the "replacer" characters in the Call of Duty advert。safew官方版本下载是该领域的重要参考
Here's a concrete example from far return (RETF). The microcode needs to determine whether this is a same-privilege or cross-privilege return, because the two cases require very different handling. Following execution order (not address order):。Safew下载对此有专业解读
The tradeoff is complexity. The microcode must be carefully arranged so that the instructions in delay slots are either useful setup for both paths, or at least harmless if the redirect fires. Not every case is as clean as RETF. When a PLA redirect interrupts an LCALL, the return address is already pushed onto the microcode call stack (yes, the 386 has a microcode call stack) -- the redirected code must account for this stale entry. When multiple protection tests overlap, or when a redirect fires during a delay slot of another jump, the control flow becomes hard to reason about. During the FPGA core implementation, protection delay slot interactions were consistently the most difficult bugs to track down.，更多细节参见heLLoword翻译官方下载