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Re: [PATCH v2 2/3] x86/EFI: keep debug info in xen.efi
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 23 Apr 2021 16:27:09 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 23 Apr 2021 14:27:21 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Apr 23, 2021 at 01:04:10PM +0200, Jan Beulich wrote:
> ... provided the linker supports it (which it does as of commit
> 2dfa8341e079 ["ELF DWARF in PE output"]).
>
> Without mentioning debugging sections, the linker would put them at
> VA 0, thus making them unreachable by 32-bit (relative or absolute)
> relocations. If relocations were resolvable (or absent) the resulting
> binary would have invalid section RVAs (0 - __image_base__, truncated to
> 32 bits). Mentioning debugging sections without specifying an address
> will result in the linker putting them all on the same RVA. A loader is,
> afaict, free to reject loading such an image, as sections shouldn't
> overlap. (The above describes GNU ld 2.36 behavior, which - if deemed
> buggy - could change.)
>
> Make sure our up-to-16Mb padding doesn't unnecessarily further extend
> the image.
>
> Take the opportunity and also switch to using $(call ld-option,...).
>
> Requested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks, Roger.
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