Hi Christian,
Thank you for your answers. it really helps me out a lot.
I am trying to test the techniques you mentioned about accessing a function
of a Noux process from tz_vmm. I put a file in a ram_fs and allow access to
both my noux process and tz_vmm. When i run the uImage, the file is
accessed by the noux process successfully but the tz_vmm process can't
access it. Instead i got the following log message. what is missing?
init -> tz_vmm -> vmm: unresolved pagefault at ip=73930
sp=e01fcf28
core -> pager_ep: cannot submit unknown signal context
thanks and best regards,
On Tue, Oct 20, 2015 at 9:37 PM, Christian Helmuth <
christian.helm...@genode-labs.com> wrote:
> Hello Joseph,
>
> On Tue, Oct 20, 2015 at 05:15:29PM +0200, Joseph Lee wrote:
> > Now i am trying implement the solution you have suggested me, but I have
> an
> > error. I place a file in a ram_fs file system and permit access to the
> file
> > system to a Noux process. I got the following log messages when I tried
> to
> > access the file from the Noux process. The name of the Noux process is
> > test. Appreciate if someone can help.
> >
> > no RM attachment (READ pf_addr=0 pf_ip=84ad from b2cfd156 test)
> > void Genode::Signal_transmitter::submit(unsigned int): failed - error
> 4
> > static void Genode::Pager_object::_page_fault_handler(Genode::addr_t):
> > page fault, thread 'test', cpu 0, ip=84ad, fault
> > address=0x0
>
> This means your test program is dereferencing a pointer to address 0,
> i.e., a NULL pointer. The message represent what you may know as
> "segmentation fault (SEGV)" from POSIX. So please check your program
> why the pointer you're dereferencing points to 0. Does the program
> work when compiled and executed on Linux?
>
> Regards
> --
> Christian Helmuth
> Genode Labs
>
> http://www.genode-labs.com/ · http://genode.org/
> https://twitter.com/GenodeLabs · /ˈdʒiː.nəʊd/
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