Re: [PATCH -fixes] riscv: Fix relocatable kernels with early alternatives using -fno-pie

From: Conor Dooley
Date: Fri May 26 2023 - 12:35:20 EST

On Fri, May 26, 2023 at 05:24:41PM +0100, Conor Dooley wrote:
> On Fri, May 26, 2023 at 05:46:30PM +0200, Alexandre Ghiti wrote:
> > Early alternatives are called with the mmu disabled, and then should not
> > access any global symbols through the GOT since it requires relocations,
> > relocations that we do before but *virtually*. So only use medany code
> > model for this early code.
> >
> > Signed-off-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>
> > ---
> >
> > Note that I'm not very happy with this fix, I think we need to put more
> > effort into "harmonizing" this very early code (ie before the mmu is
> > enabled) as it is spread between different locations and compiled
> > differently.
> Totally & I'll happily spend the time trying to review that work.
> > I'll work on that later, but for now, this fix does what is
> > needed to work (from my testing at least). Any Tested-by on the Unmatched
> > and T-head boards is welcome!
> On 6.4-rc1 & v6.4-rc1 + this patch, with CONFIG_RELOCATABLE added to my
> config, my Nezha fails to boot. There is no output whatsoever from the
> kernel. Turning off CONFIG_RELOCATABLE boots again.

I don't know if this is better or worse news, but same thing happens on
an icicle kit. What systems, other than QEMU, has the relocatable
eries been tested with, btw?


> I didn't test on my unmatched.
> Thanks,
> Conor.

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