Re: [PATCH 3/9] efi/x86: Move efi stub globals from .bss to .data

Arvind Sankar
2020-04-11T01:03:46Z

On Fri, Apr 10, 2020 at 08:03:15PM +0200, Ard Biesheuvel wrote:
> > >
> > > We'll still need .data.efistub for the .data pieces, but that is a
> > > separate issue.
> >
> > You can avoid that by using an archive specification like above. i.e.
> > adding
> > drivers/firmware/efi/libstub/lib.a:(.data .data.*)
> > to the .init.data output section will pull in just the .data input
> > sections from the EFI stub into the .init.data section.
>
> Sure. But the ARM decompressor linker script currently discards .data
> before this point in the linker script, and relies on this as a safety
> net to ensure that no new .data items get added to the decompressor
> binary (which runs after the stub)

You should be able to use EXCLUDE_FILE to skip discarding the .data
section from libstub. That also supports the archive: syntax according
to the docs though I haven't tried it.