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From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Jan Beulich <jbeulich@suse.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	Andrew Cooper <andrew.cooper3@citrix.com>, Wei Liu <wl@xen.org>
Subject: Re: [PATCH v2 2/3] x86/EFI: keep debug info in xen.efi
Date: Fri, 23 Apr 2021 16:27:09 +0200	[thread overview]
Message-ID: <YILZPbRRR26nYRWt@Air-de-Roger> (raw)
In-Reply-To: <084ef874-3ef2-cb52-bc4b-3b9d78c826ae@suse.com>

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@citrix.com>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Roger Pau Monné <roger.pau@citrix.com>

Thanks, Roger.


  reply	other threads:[~2021-04-23 14:27 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-23 11:02 [PATCH v2 0/3] x86/EFI: build adjustments Jan Beulich
2021-04-23 11:03 ` [PATCH v2 1/3] x86/EFI: sections may not live at VA 0 in PE binaries Jan Beulich
2021-04-23 14:25   ` Roger Pau Monné
2021-04-23 14:46     ` Jan Beulich
2021-04-23 11:04 ` [PATCH v2 2/3] x86/EFI: keep debug info in xen.efi Jan Beulich
2021-04-23 14:27   ` Roger Pau Monné [this message]
2021-04-23 11:04 ` [PATCH v2 3/3] x86/EFI: don't have an overly large image size Jan Beulich

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