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Re: KEEP Re: [PATCH 2/2] xen: Add CONFIG_GC_SECTIONS
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Wed, 10 Dec 2025 12:11:42 -0500
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- Delivery-date: Wed, 10 Dec 2025 17:12:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2025-12-10 11:55, Andrew Cooper wrote:
On 09/12/2025 9:47 pm, Jason Andryuk wrote:
. = ALIGN(4);
__alt_instructions = .;
- *(.altinstructions)
+ KEEP(*(.altinstructions))
__alt_instructions_end = .;
Thinking about this, what we need is for there to be a reference tied to
the source location, referencing the replacement metadata and
replacement instructions.
Looking at https://maskray.me/blog/2021-02-28-linker-garbage-collection
might be able to do this with .reloc of type none. In fact,
BFD_RELOC_NONE seems to have been invented for precisely this purpose.
This means that if and only if the source function gets included, so
does the metadata and replacement.
Yes. Thanks for the reference. I'll take a look.
Regards,
Jason
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