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Optimize arg retrieval from stack #121

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@kvanhees

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@kvanhees

Right now we have a loop over the argN values that need to be retrieved from the stack, and retrieve them one by one, using the bpf_probe_read_kernel helper. But, since the values will be in consecutive stack slots and we are going to store them in consecutive slots in the mstate, we can simply do a larger read using a single helper call.

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