From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 121573858023; Thu,  3 Dec 2020 12:37:16 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 121573858023
From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/27004] ld.so is miscompiled by GCC 11
Date: Thu, 03 Dec 2020 12:37:15 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: dynamic-link
X-Bugzilla-Version: 2.33
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hjl.tools at gmail dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: security-
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-27004-131-9y3b79Csj5@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-27004-131@http.sourceware.org/bugzilla/>
References: <bug-27004-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: glibc-bugs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-bugs mailing list <glibc-bugs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-bugs/>
List-Help: <mailto:glibc-bugs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Thu, 03 Dec 2020 12:37:16 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D27004

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
How about this

diff --git a/sysdeps/x86_64/nptl/tls.h b/sysdeps/x86_64/nptl/tls.h
index a08bf972de..4eeab0e7a9 100644
--- a/sysdeps/x86_64/nptl/tls.h
+++ b/sysdeps/x86_64/nptl/tls.h
@@ -180,11 +180,19 @@ _Static_assert (offsetof (tcbhead_t, __glibc_unused2)=
 =3D=3D
0x80,
    assignments like
        pthread_descr self =3D thread_self();
    do not get optimized away.  */
-# define THREAD_SELF \
+# if __GNUC_PREREQ (11, 0)
+#  define THREAD_SELF \
+  ({ struct pthread *__self;                                              =
   \
+     __self =3D (struct pthread *) (__builtin_thread_pointer ()           =
     \
+                                 + offsetof (struct pthread, header.self))=
;  \
+     __self;})
+# else
+#  define THREAD_SELF \
   ({ struct pthread *__self;                                              =
   \
      asm ("mov %%fs:%c1,%0" : "=3Dr" (__self)                             =
     \
          : "i" (offsetof (struct pthread, header.self)));                 =
   \
      __self;})
+# endif

 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 # define DB_THREAD_SELF_INCLUDE  <sys/reg.h> /* For the FS constant.  */

--=20
You are receiving this mail because:
You are on the CC list for the bug.=