RPCEmu on Genode

[Michael Grunditz]

On Thu, 15 Oct 2020 at 22:02, Norman Feske <norman.feske at genode-labs.com> wrote:

>
> Since you are using the libc, the cleanest way forward would be the mmap
> (PROT_EXEC) approach. You are right that (our current version of) mmap
> does not support the passing of -1 as fd. But passing a valid file
> descriptor is supposed to work, for example:
>
>   int const zero_fd = open("/dev/zero", O_RDWR);
>
>   void *ptr = mmap((void *)-1, 1024*512,
>                    PROT_EXEC, MAP_ANONYMOUS, zero_fd, 0);
>

Not related to Genode , but my main issue is that the instruction
table *was* a static 2d array.. Hard to change base address of that
one!
So I have now converted the whole thing to use a pointer , which is
allocated using the Genode API. It doesn't work, getting exec faults
from ram. But I will get there.

Just one more related question. Can exec fault reported by Genode mean
a invalid instruction or is it just that it can't exec it?

Michael