Google traces: LOAD-STORE-BRANCH

[Heiner Litz]

Hi,

Google v2 traces contain instructions for which the following 3 categories are set:

DR_INSTR_CATEGORY_LOAD &&

DR_INSTR_CATEGORY_STORE &&

DR_INSTR_CATEGORY_BRANCH

store & branch respectively load & branch, I assume map to CALL respectively RET, but I am not aware of any x86 or ARM instruction that does load & store & branch.

I need to map these instructions to an x86-like IR so that they can be executed on a simulator; any help in understanding what these instructions are would be appreciated.

Heiner 

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https://people.ucsc.edu/~hlitz/

[Derek Bruening]

Indirect call with target in memory.  Did you check the record type?  That would solve this for you.  Branch types are identified with separate record types: TRACE_TYPE_INSTR_INDIRECT_CALL, with a TRACE_MARKER_TYPE_BRANCH_TARGET with its target.

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[Heiner Litz]

Hi Derek,

I thought this info had been stripped from the traces, yes that makes it much easier! Thanks for answering this and my last question so promptly.

Heiner

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https://people.ucsc.edu/~hlitz/