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Re: [PATCH] xen/link: Include .debug_str_offsets in DWARF2_DEBUG_SECTIONS
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 22 Apr 2025 16:46:09 +0200
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 22 Apr 2025 14:46:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.04.2025 16:42, Andrew Cooper wrote:
> On 22/04/2025 1:13 pm, Jan Beulich wrote:
>> On 22.04.2025 13:32, Andrew Cooper wrote:
>>> --- a/xen/include/xen/xen.lds.h
>>> +++ b/xen/include/xen/xen.lds.h
>>> @@ -56,6 +56,7 @@
>>> DECL_DEBUG2(.debug_info, .gnu.linkonce.wi.*, 1) \
>>> DECL_DEBUG(.debug_types, 1) \
>>> DECL_DEBUG(.debug_str, 1) \
>>> + DECL_DEBUG(.debug_str_offsets, 1) \
>> The alignment wants to be at least 4.
>
> I checked before making this patch, and Clang uses alignment 1 on the
> section:
>
>> [8134] .debug_str_offsets PROGBITS 0000000000000000 16fe11d
>> 21c868 00 0 0 1
Oh, I'm surprised. The table holding 4- (or 8-) byte values, it should
have better alignment already in object files, I would think. Feels like
a bug / oversight in Clang.
>> [8135] .rela.debug_str_offsets RELA 0000000000000000 2089e08
>> ca6b60 18 I 8136 8134 8
>
> Is there an official spec on the matter?
I did look through the Dwarf5 spec, but could find any detail of this
kind there.
Jan
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