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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/96200] Implement __builtin_thread_pointer() and
 __builtin_set_thread_pointer() if TLS is supported
Date: Sat, 29 Aug 2020 02:07:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96200

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
But

CR4.FSGSBASE

FSGSBASE-Enable Bit (bit 16 of CR4) =E2=80=94 Enables the instructions RDFS=
BASE,
RDGSBASE, WRFSBASE, and WRGSBASE.

>>From user space, we can't tell if FSGSBASE is enabled.=