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Re: [Xen-devel] [PATCH v3 1/3] x86/linker: add a reloc section to ELF linker script


  • To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 27 Jun 2019 11:59:46 +0100
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  • Cc: Daniel Kiper <daniel.kiper@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
  • Delivery-date: Thu, 27 Jun 2019 11:00:00 +0000
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On 27/06/2019 10:33, Roger Pau Monne wrote:
> if the hypervisor has been built with EFI support (ie: multiboot2).
> This allows to position the .reloc section correctly in the output
> binary.
>
> Note that for the ELF output format the .reloc section is moved before
> .bss because the data it contains is read-only, so it belongs with the
> other sections containing read-only data.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

I have to admit that I'm still confused as to why we need this in the
first place.

The ELF build is linked to a fixed virtual address, irrespective of
whether grub loads it via MB1 or MB2 and/or with EFI details.

i.e. the non-EFI build shouldn't have any remaining relocations by the
time it is fully linked.

Or am I missing something?

~Andrew

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