Thank you Jason for your quick reply!
On Sat, May 19, 2018 at 12:50 PM, Srajan Khare <rsk...@gmail.com> wrote:
> Hi friends,
>
> I have been implementing Cache Compression algorithm in gem5.
> So in order to tap data for all the writes into L3 cache I have been using
> handleFill() function in cache.cc file. I have been using following command
> to transfer data in compressed format into L3 cache.
>
> ---------------*Code snippet*-----------------
>
> //Only for L3 cache
> uint8_t *dataofCacheLine;
>
> memcpy(dataOfCacheLine, pkt->getConstPtr<uint8_t>(), blkSize);
>
> compr_Info = compressionAlgo (dataOfCacheLine, .................,
> .................);
>
> //compr_Info contains compressed data and new size.
> //compressed data is then transferred into blk->data in the following way
>
> memcpy(blk->data, compr_info.comprData, compr_info.comprSize);
>
> --------------------------------------------
>
> Doing this leads to SIGABRT signal which terminates the execution with a
> panic ("Tried to read unmapped address 0x100000000a8"). I debugged it with
> gdb and log files and got myself zero'd down to error in memcpy statement.
>
> Could any of you let me know why there is a crash due to second memcpy
> statement provided compressed data I am storing is consistent with the
> actual data referenced by the block?
> Does any addressing gets disturbed when I am doing it like this? If Yes,
> could you please give me some inputs on this??
>
> Thanks a lot in advance!
>
>
>
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