AArch64: Cleanup ifuncs

Cleanup ifuncs.  Remove uses of libc_hidden_builtin_def, use ENTRY rather than
ENTRY_ALIGN, remove unnecessary defines and conditional compilation.  Rename
strlen_mte to strlen_generic.  Remove rtld-memset.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
(cherry picked from commit 9fd3409842b3e2d31cff5dbd6f96066c430f0aa2)

1 files changed, 39 insertions, 0 deletions

diff --git a/sysdeps/aarch64/multiarch/strlen_generic.S b/sysdeps/aarch64/multiarch/strlen_generic.S
new file mode 100644
index 0000000000..014e376ec1
--- /dev/null
+++ b/sysdeps/aarch64/multiarch/strlen_generic.S
@@ -0,0 +1,39 @@
+/* A Generic Optimized strlen implementation for AARCH64.
+   Copyright (C) 2018-2022 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/>.  */
+
+/* The actual strlen code is in ../strlen.S.  If we are building libc this file
+   defines __strlen_generic.  Otherwise the include of ../strlen.S will define
+   the normal __strlen entry points.  */
+
+#include <sysdep.h>
+
+#if IS_IN (libc)
+
+# define STRLEN __strlen_generic
+
+/* Do not hide the generic version of strlen, we use it internally.  */
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name)
+
+# ifdef SHARED
+/* It doesn't make sense to send libc-internal strlen calls through a PLT. */
+	.globl __GI_strlen; __GI_strlen = __strlen_generic
+# endif
+#endif
+
+#include "../strlen.S"