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Re: [PATCH 3/6] x86/efi: discard .text.header for PE binary
- To: Frediano Ziglio <freddy77@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 5 Jun 2026 09:55:15 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Fri, 05 Jun 2026 07:55:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.06.2026 16:53, Frediano Ziglio wrote:
> On Thu, 4 Jun 2026 at 15:31, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 04/06/2026 11:28 am, Frediano Ziglio wrote:
>>> On Tue, 2 Jun 2026 at 13:15, Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>>>> --- a/xen/arch/x86/xen.lds.S
>>>>> +++ b/xen/arch/x86/xen.lds.S
>>>>> @@ -57,6 +57,9 @@ SECTIONS
>>>>> __image_base__ = .;
>>>>> #else
>>>>> . = __image_base__;
>>>>> + /DISCARD/ : {
>>>>> + *(.text.header)
>>>>> + }
>>>>> #endif
>>>> We already have DISCARD_SECTIONS, so I think it needs clarifying why that
>>>> can't be used / extended.
>>>>
>>> Yes, this can be done that way. Roger, do you agree on this ?
FTOAD: I did _not_ suggest to make use of DISCARD_SECTIONS, as that
won't work. Instead I did ask that it be clarified in the description
why DISCARD_SECTIONS cannot be extended for the purpose here.
>> You'll need to add a general ARCH_DISCARD_SECTIONS, and have x86 fill in
>> {ELF,EFI}_DISCARD_SECTIONS conditionally.
>
> I think binutils simply ignore sections not present so this is not
> necessary. I'll test it.
But you can't discard .text.header blindly everywhere. The reason it can
be discarded on x86, and only for xen.efi, is very much x86-specific.
Jan
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