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Re: [PATCH] RFC: xen/x86: Enable --gc-sections
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 10 Dec 2025 08:25:25 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Grygorii Strashko <grygorii_strashko@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 10 Dec 2025 07:25:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.12.2025 23:28, Jason Andryuk wrote:
> --- a/xen/arch/x86/xen.lds.S
> +++ b/xen/arch/x86/xen.lds.S
> @@ -76,7 +76,7 @@ SECTIONS
> _start = .;
> DECL_SECTION(.text) {
> _stext = .; /* Text and read-only data */
> - *(.text.header)
> + KEEP(*(.text.header))
Andrew already commented on the KEEP()s, yet I'd like to extend on that. The
one above looks to be necessary (from an abstract pov; in practice it shouldn't
be necessary due the entry point being there), but ...
> @@ -98,7 +98,7 @@ SECTIONS
> #endif
> *(.text.__x86_indirect_thunk_*)
>
> - *(.fixup)
> + KEEP(*(.fixup))
> *(.gnu.warning)
> _etext = .; /* End of text section */
> } PHDR(text) = 0x9090
> @@ -116,12 +116,12 @@ SECTIONS
> . = ALIGN(8);
> /* Exception table */
> __start___ex_table = .;
> - *(.ex_table)
> + KEEP(*(.ex_table))
... these two for example should be strictly be omitted (as Andrew also hinted
at). I think more preparatory work is necessary here: We may need to use
section groups to associate auxiliary sections with their main ones. Otherwise,
by pulling in full .fixup or .ex_table from an object file, technically unused
.text.* would also need to be retained (due to .fixup / .ex_table having
references into there).
Jan
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