I'm hazy on the details at this point since it's been a while since I've looked at the code, but the main function you want is in ptlsim/sim/ptl-qemu.cpp:
int Context::copy_from_user(void * target, Waddr source, int bytes, PageFaultErrorCode& pfec, Waddr& faultaddr, bool forexec) This function calls the low level ldub_user and ldub_kernel functions which actually go into QEMU's memory space and pull out the data. The funtion then copies the bytes to the target buffer that you provide. You can grep around the code to see an example for how to use it. One such example can be found when marss loads instructions to be executed into the trace buffer in ptlsim/x86/decode-core.cpp:1998 Hopefully that's enough information to get you started. On Tue, Mar 6, 2012 at 8:28 PM, Yingying Tian <[email protected]> wrote: > Hi Paul, > > Thank you for your reply. Yes I'd like to know more about accessing real > data on Marss. It would be great if you could find the function and related > information for me. Thank you in advance. > > > Thanks, > Yingying > > > On Tue, Mar 6, 2012 at 6:43 PM, Paul Rosenfeld <[email protected]>wrote: > >> The caches only store tag information. The ptlsim portion of the >> simulator mostly deals with timings, so the model only really needs to know >> if there was a cache hit or a cache miss. >> >> The data is available by calling into QEMU. There are some low level load >> functions that could be used to load the actual data given. At the moment >> I'm having trouble remembering which type of address you need (I believe it >> is host virtual) to get access to this data. If you need more detail I can >> try to find the function for you. >> >> On Tue, Mar 6, 2012 at 5:54 PM, Yingying Tian <[email protected]> wrote: >> >>> To whom it may concern, >>> >>> Is it possible to get the real data (cache block) fetched from the main >>> memory? As I know so far, each request contains core-id, physical address, >>> instruction/data type, etc. If I expect to check the content of cache >>> blocks, are there any ways to get the data information? >>> >>> >>> Thanks, >>> Yingying >>> >>> _______________________________________________ >>> http://www.marss86.org >>> Marss86-Devel mailing list >>> [email protected] >>> https://www.cs.binghamton.edu/mailman/listinfo/marss86-devel >>> >>> >> >
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