对内存的操作被允许，但是必须支持地址偏移值，即，对于给出的地址，加上一个偏移量，此时也是一个合法的地址。
"o" : A memory operand is allowed, but only if the address is offsettable. ie, adding a small offset to the address gives a valid address.
文件偏移和内存地址是不容易的相关。
RVA是将某一项加载到内存之后的地址，减去镜像文件的基地址得到的值(也就是从文件加载到内存之后的基地址开始的偏移量)。
An RVA is the address of an item once loaded into memory, with the base address of the image file subtracted from it (i. e., the offset from the base address where the file is loaded).
RVA是将某一项加载到内存之后的地址，减去镜像文件的基地址得到的值(也就是从文件加载到内存之后的基地址开始的偏移量)。
An RVA is the address of an item once loaded into memory, with the base address of the image file subtracted from it (i. e., the offset from the base address where the file is loaded).
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