1 files changed, 50 insertions, 0 deletions
diff --git a/sysdeps/i386/multiarch/strnlen.c b/sysdeps/i386/multiarch/strnlen.c
new file mode 100644
index 0000000000..3e97c9e0e6
--- /dev/null
+++ b/sysdeps/i386/multiarch/strnlen.c
@@ -0,0 +1,50 @@
+/* Multiple versions of strnlen.
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 2015 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
+   <http://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+#if IS_IN (libc)
+/* Redefine strnlen so that the compiler won't complain about the type
+   mismatch with the IFUNC selector in strong_alias, below.  */
+# undef strnlen
+# define strnlen __redirect_strnlen
+# include <string.h>
+# undef strnlen
+
+# include <init-arch.h>
+
+extern __typeof (__redirect_strnlen) __strnlen_i386 attribute_hidden;
+extern __typeof (__redirect_strnlen) __strnlen_sse2 attribute_hidden;
+
+/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
+   ifunc symbol properly.  */
+extern __typeof (__redirect_strnlen) __strnlen;
+extern void *strnlen_ifunc (void) __asm__ ("__strnlen");
+
+void *
+strnlen_ifunc (void)
+{
+  if (HAS_CPU_FEATURE (SSE2))
+    return __strnlen_sse2;
+
+  return __strnlen_i386;
+}
+__asm__ (".type __strnlen, %gnu_indirect_function");
+
+weak_alias (__strnlen, strnlen)
+#endif