[GSoC - x86_64 BSP] Using fPIC to compile RTEMS as a shared library

[Joel Sherrill]

On Thu, Jun 7, 2018, 9:01 PM Chris Johns <chrisj at rtems.org> wrote:

> On 08/06/2018 01:50, Amaan Cheval wrote:
> >
> > Joel, Chris, I'd appreciate guidance on what I ought to work on next
>
> I would like to see the focus on the kernel context switcher, FPU support,
> and
> then interrupts so we have the basic drivers we need like a tick interrupt
> running.
>

+1

>
> This assumes the loader issues we have not resolved do not effect this
> work.
>
> > and what
> > discussions we need to have to decide between the "bundled kernel.so
> approach"
> > (the one implemented here) vs. the "FreeBSD loader.efi+hello.exe"
> approach. Let
> > me know!
> >
>
> I do not think I can help too much here. I understand the loader.efi+exe
> solution and it should work because all RTEMS applications we have are
> statically linked (I am assuming it is here). I have not looked at the
> details
> being used with the -fPIC and .so solution so I cannot comment. I do have
> some
> concerns the relocatable exe might expose some dark corners and issues in
> the
> host tools we have, for example how does GDB find the base address of the
> image
> so you can debug it? and is this just working or is it really suppose to
> work
> this way?
>

All I can say is that with Deos/RTEMS, we use PIC on arm, PowerPC, and x86.
We have spent a lot of time debugging with gdb attached to qemu. I haven't
seen any tools issues yet.



> Chris
>
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