memory dump

[Abhay Amala]

Thank you Martin for your detailed explanation. It helps me a lot.

I could put the RAM data into a file using the following snippet and get a
file with size 268.4 MB. But when i tried to make some kind memory analysis
on the file, i get something which is different from what i expect. Is this
snippet the right one to do memory imaging? thanks in advance for answers.

         size_t size = Vm_base::ram()->size();
         void* addr = (void*)Vm_base::ram()->local();
         FILE *fd = fopen("memdump.dd", "w+b");
         if(fd != NULL)
                 fwrite(addr, 1, size, fd);

Thanks,
Abhay

On Thu, Dec 3, 2015 at 11:35 AM, Martin Stein <martin.stein at ...1...>
wrote:

> Hey Abhay,
>
> First of all, sorry for the late feedback, last week, I couldn't find
> the time to answer your mail.
>
> Am 27.11.2015 um 00:19 schrieb Abhay Amala:
> > I am running tz_vmm on imx53qsb and thinking about taking a snapshot of
> > the normal world memory inside the tz_vmm app and put into a file as a
> > raw data. I appreciate if anyone give me a hint.
>
> Inside the tz_vmm the guest RAM is already mapped. You can get its local
> base address via Vm_base::ram()->local(). Its size can be read via
> Vm_base::ram()->size().
>
> However, be aware that the state you read from the guest RAM in tz_vmm
> is most probably not up-to-date as the non-secure world uses separate
> caches that do not synchronize with the caches of the secure world. As
> far as I know, there is no way to cause a non-secure cache flush from
> within the secure world. But I might be wrong as I haven't read the
> manual [1] in depth regarding this topic. Maybe it's a solution to
> implement a simple protocol between VMM and VM, using interrupt
> injection and SMCs to requests the guest OS to flush its caches for you.
>
> Regarding the file you want to create from the read RAM data: It might
> be a good idea to use the SD card as storage medium as an appropriate
> driver [2] already exists. However, the driver provides a Block session
> while you want to use a File_system session in tz_vmm. Assuming, that
> you have formatted your SD partition with FAT32, you can create a
> File_system session out of a Block session by using use ffat_fs. You may
> have a look at the test scripts [3] to receive an impression on how
> ffat_fs is used.
>
> If you have further questions, don't hesitate to ask ;)
>
> Cheers,
> Martin
>
> [1] https://cache.freescale.com/files/32bit/doc/ref_manual/iMX53RM.pdf
> [2] repos/os/src/drivers/sd_card/spec/imx53
> [3]
> repos/libports/run/libc_ffat_fs.run
> repos/libports/run/libc_ffat.run
>
>
> ------------------------------------------------------------------------------
> Go from Idea to Many App Stores Faster with Intel(R) XDK
> Give your users amazing mobile app experiences with Intel(R) XDK.
> Use one codebase in this all-in-one HTML5 development environment.
> Design, debug & build mobile apps & 2D/3D high-impact games for multiple
> OSs.
> http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140
> _______________________________________________
> genode-main mailing list
> genode-main at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/genode-main
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.genode.org/pipermail/users/attachments/20151203/5e413729/attachment.html>