Move <thread_pointer.h> to kernel-independent sysdeps directories

Hurd is expected to use the same thread ABI as Linux.

Reviewed-by: Michael Jeanson <mjeanson@efficios.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/sysdeps/x86/thread_pointer.h b/sysdeps/x86/thread_pointer.h
new file mode 100644
index 0000000000..4c02c8daab
--- /dev/null
+++ b/sysdeps/x86/thread_pointer.h
@@ -0,0 +1,38 @@
+/* __thread_pointer definition.  x86 version.
+   Copyright (C) 2021-2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_THREAD_POINTER_H
+#define _SYS_THREAD_POINTER_H
+
+static inline void *
+__thread_pointer (void)
+{
+#if __GNUC_PREREQ (11, 1)
+  return __builtin_thread_pointer ();
+#else
+  void *__result;
+# ifdef __x86_64__
+  __asm__ ("mov %%fs:0, %0" : "=r" (__result));
+# else
+  __asm__ ("mov %%gs:0, %0" : "=r" (__result));
+# endif
+  return __result;
+#endif /* !GCC 11 */
+}
+
+#endif /* _SYS_THREAD_POINTER_H */