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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113874] GNU2 TLS descriptor calls do not follow psABI on
 x86_64-linux-gnu
Date: Sun, 11 Feb 2024 18:00:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113874

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #4)
> (In reply to H.J. Lu from comment #3)
> > Created attachment 57385 [details]
> > A patch
> >=20
> > Try this.
>=20
> This doesn't work properly.  To work around in ld.so, _dl_tlsdesc_dynamic
> needs
> to save and restore ALL registers, which can be expensive.

Or it could be compiled with options to make sure it doesn't use vector
registers etc., and only save/restore if it needs to call into some code wh=
ere
libc can't afford that (say allocate memory).=