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Re: [Xen-devel] [PATCH 3/4] x86/linker: add a reloc section to ELF binary
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 19 Jun 2019 12:20:40 +0100
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- Cc: Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Wed, 19 Jun 2019 11:20:59 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 19/06/2019 12:02, Roger Pau Monne wrote:
> If the hypervisor has been built with EFI support (ie: multiboot2).
Seeing as this continues the sentence from the subject, it should start
without a capital. Otherwise the result is werd to read.
> This allows to position the .reloc section correctly in the output
> binary, or else the linker might place .reloc before the .text
> section.
Really? How can this be a legitimate transformation for the linker to make?
>
> Note that the .reloc section is moved before .bss for two reasons: in
> order for the resulting binary to not contain any section with data
> after .bss, so that the file size can be smaller than the loaded
> memory size, and because the data it contains is read-only, so it
> belongs with the other sections containing read-only data.
The content of .relocs is transformed via mkreloc to become
__base_relocs_{start,end} and shouldn't exist into the final linked
image AFAICT.
Since the MB1/MB2 builds aren't relocatable, I think we might be able to
get away with simply excluding them in the non-EFI build.
~Andrew
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