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commit 8dbeb0561eeb876f557ac9eef5721912ec074ea5
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Dec 9 09:49:32 2021 +0100
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nptl: Add <thread_pointer.h> for defining __thread_pointer
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<tls.h> already contains a definition that is quite similar,
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but it is not consistent across architectures.
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Only architectures for which rseq support is added are covered.
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Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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diff --git a/sysdeps/nptl/thread_pointer.h b/sysdeps/nptl/thread_pointer.h
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new file mode 100644
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index 0000000000000000..92f2f3093eba55bb
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--- /dev/null
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+++ b/sysdeps/nptl/thread_pointer.h
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@@ -0,0 +1,28 @@
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+/* __thread_pointer definition. Generic version.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifndef _SYS_THREAD_POINTER_H
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+#define _SYS_THREAD_POINTER_H
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+
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+static inline void *
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+__thread_pointer (void)
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+{
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+ return __builtin_thread_pointer ();
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+}
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+
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+#endif /* _SYS_THREAD_POINTER_H */
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diff --git a/sysdeps/powerpc/nptl/thread_pointer.h b/sysdeps/powerpc/nptl/thread_pointer.h
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new file mode 100644
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index 0000000000000000..8fd5ba671f6f5e64
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--- /dev/null
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+++ b/sysdeps/powerpc/nptl/thread_pointer.h
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@@ -0,0 +1,33 @@
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+/* __thread_pointer definition. powerpc version.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifndef _SYS_THREAD_POINTER_H
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+#define _SYS_THREAD_POINTER_H
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+
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+static inline void *
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+__thread_pointer (void)
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+{
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+#ifdef __powerpc64__
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+ register void *__result asm ("r13");
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+#else
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+ register void *__result asm ("r2");
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+#endif
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+ return __result;
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+}
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+
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+#endif /* _SYS_THREAD_POINTER_H */
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diff --git a/sysdeps/x86/nptl/thread_pointer.h b/sysdeps/x86/nptl/thread_pointer.h
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new file mode 100644
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index 0000000000000000..6b71b6f7e1401e4c
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--- /dev/null
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+++ b/sysdeps/x86/nptl/thread_pointer.h
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@@ -0,0 +1,38 @@
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+/* __thread_pointer definition. x86 version.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifndef _SYS_THREAD_POINTER_H
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+#define _SYS_THREAD_POINTER_H
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+
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+static inline void *
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+__thread_pointer (void)
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+{
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+#if __GNUC_PREREQ (11, 1)
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+ return __builtin_thread_pointer ();
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+#else
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+ void *__result;
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+# ifdef __x86_64__
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+ __asm__ ("mov %%fs:0, %0" : "=r" (__result));
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+# else
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+ __asm__ ("mov %%gs:0, %0" : "=r" (__result));
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+# endif
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+ return __result;
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+#endif /* !GCC 11 */
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+}
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+
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+#endif /* _SYS_THREAD_POINTER_H */
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