Hex Rays
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Microcode in pictures

Since a picture is worth thousand words below are a few drawings for your perusal. Let us start at the top level, with the mbl_array_t class, which represents the entire microcode object:


The above picture does not show the control flow graph. For that we use predecessor and successor lists:


Pay attention to the block types here, they tell us how many outgoing edges must be present. Then, each basic block (mblock_t) contains a list of instructions:


Instructions (minsn_t) can be nested, and the next drawing shows how it looks like:

As you see, conceptually things are quite simple. But the devil is in the details, as usual 🙂

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