1 files changed, 68 insertions, 0 deletions
diff --git a/sysdeps/i386/dl-tls-get-addr.c b/sysdeps/i386/dl-tls-get-addr.c
new file mode 100644
index 0000000..c97e5c5
--- /dev/null
+++ b/sysdeps/i386/dl-tls-get-addr.c
@@ -0,0 +1,68 @@
+/* Ifunc selector for ___tls_get_addr.
+   Copyright (C) 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/>.  */
+
+#ifdef SHARED
+# define ___tls_get_addr __redirect____tls_get_addr
+# include <dl-tls.h>
+# undef ___tls_get_addr
+# undef __tls_get_addr
+
+# define SYMBOL_NAME ___tls_get_addr
+# include <init-arch.h>
+
+extern __typeof (REDIRECT_NAME) OPTIMIZE (fnsave) attribute_hidden;
+extern __typeof (REDIRECT_NAME) OPTIMIZE (fxsave) attribute_hidden;
+extern __typeof (REDIRECT_NAME) OPTIMIZE (xsave) attribute_hidden;
+extern __typeof (REDIRECT_NAME) OPTIMIZE (xsavec) attribute_hidden;
+
+static inline void *
+IFUNC_SELECTOR (void)
+{
+  const struct cpu_features* cpu_features = __get_cpu_features ();
+
+  if (cpu_features->xsave_state_size != 0)
+    {
+      if (CPU_FEATURE_USABLE_P (cpu_features, XSAVEC))
+	return OPTIMIZE (xsavec);
+      else
+	return OPTIMIZE (xsave);
+    }
+  else if (CPU_FEATURE_USABLE_P (cpu_features, FXSR))
+    return OPTIMIZE (fxsave);
+  return OPTIMIZE (fnsave);
+}
+
+libc_ifunc_redirected (__redirect____tls_get_addr, ___tls_get_addr,
+		       IFUNC_SELECTOR ());
+
+/* The special thing about the x86 TLS ABI is that we have two
+   variants of the __tls_get_addr function with different calling
+   conventions.  The GNU version, which we are mostly concerned here,
+   takes the parameter in a register.  The name is changed by adding
+   an additional underscore at the beginning.  The Sun version uses
+   the normal calling convention.  */
+
+rtld_hidden_proto (___tls_get_addr)
+rtld_hidden_def (___tls_get_addr)
+
+void *
+__tls_get_addr (tls_index *ti)
+{
+  return ___tls_get_addr (ti);
+}
+#endif