我看着X86 as,I wanna试图读到它,并在我的配方法和OPTIMIZE中找到一个ug子。 但是,在计算指示时,总价有许多间接费用。 我似乎无法找到一种办法,确定那些正在从事其他任务的人正在计算地址的方法。 例如,在计算一个短片时可以使用的中值地址时,也可使用一个附加物,或者在我的代码中定期进行附加操作。
这样做是容易的,就像他们使用固定登记册进行处理计算一样? 或者我是否必须从一开始就追踪该守则?
<>strong>EDIT: 看来没有明确的方法确定这些内容。 但是,假设只有搬走、添加、子和皮革才能处理计算指示? 或者x86有什么更为复杂的问题?
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No, not really. Most registers are general purpose, and used for all kinds of calculations. Some compilers are even smart enough to use address calculating instructions like LEA to compute other things.
你可能必须找到一个变量被装入登记册的地方,然后从登记册上看。
你们可以从一开始就追踪该守则。 例如,有读或书写记忆登记册的指示(例如:mov eax, [ebx],使用Microsoft syntax)。 如你看到这种指示,你可以确定哪些登记作为地址(例如ebx),然后回到代码中,看如何计算登记册。
了解“jump”指示——如果你的法典有相当的有条件执行,那么“重新加入法典”可能很难,而仅仅“从一开始就停止守则”可能比较容易。
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