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+|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(**)
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NAME=FETCHARG : Set NAME as the argument name of FETCHARG.
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FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types
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(*) only for return probe.
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(**) this is useful for fetching a field of data structures.
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Bitfield is another special type, which takes 3 parameters, bit-width, bit-
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65
Per-Probe Event Filtering
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