1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/um/tls_64.c b/arch/x86/um/tls_64.c
new file mode 100644
index 000000000..3a621e0d3
--- /dev/null
+++ b/arch/x86/um/tls_64.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/sched.h>
+#include <asm/ptrace-abi.h>
+
+void clear_flushed_tls(struct task_struct *task)
+{
+}
+
+int arch_copy_tls(struct task_struct *t)
+{
+	/*
+	 * If CLONE_SETTLS is set, we need to save the thread id
+	 * (which is argument 5, child_tid, of clone) so it can be set
+	 * during context switches.
+	 */
+	t->thread.arch.fs = t->thread.regs.regs.gp[R8 / sizeof(long)];
+
+	return 0;
+}