Re: [DynInst_API:] Logging the stack trace

[Xiaozhu Meng <mxz297@xxxxxxxxx>]

Do you want to collect all stack traces during its run or you have a few points you are interested in where you want to collect stack traces (such as function entries, basic block entries)?Â

On Mon, Apr 23, 2018 at 4:20 PM, budchan chao <cbudchan@xxxxxxxxx> wrote:

Right, I want to just collect all the return addresses and get all the stack traces a program makes during its run. So would work if I add this stack walking code as part of return instrumentation?

On Monday, 23 April, 2018, 4:50:44 PM GMT-4, Xiaozhu Meng <mxz297@xxxxxxxxx> wrote:

Hi,

Passing (rsp) to your instrumentation function is not going to do what you plan to do because Dyninst's internal instrumentation code will have changed the value of rsp.Â

For us to better help you, can you describe what exactly you would like to do? It seems to me that you are trying to collecting return addresses and manually reconstruct call stacks. If it is the case, the stackwalkAPI is better suited for this purpose. You can refer the documentation for better idea of what stackwalkAPI can do (https://github.com/mxz297/dyninst/blob/master/stackwalk/doc/stackwalk.pdf).Â

Thanks,

--Xiaozhu

On Sun, Apr 22, 2018 at 2:49 PM, budchan chao <cbudchan@xxxxxxxxx> wrote:

I want to use Dyninst to trace the runtime stack. I was thinking doing a call out to an instrumentation function at each function entry which would accept the dereferenced rsp value (which will be the return address at the function entry) as an argument and log it within this instrumentation function which I load from a shared library. I am not quite sure how to get the dereferenced register value and do the function call using it as an argument. I see Bpatch_registerExpr but I am not sure how to initialize with the dereferenced rsp register value. Can somebody give me a pointer on how to do this? Or is there a better of doing it?Â

Thanks

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