aarch64: Add aarch64-specific files for memory tagging support

This final patch provides the architecture-specific implementation of
the memory-tagging support hooks for aarch64.

1 files changed, 37 insertions, 0 deletions

diff --git a/sysdeps/aarch64/__mtag_new_tag.S b/sysdeps/aarch64/__mtag_new_tag.S
new file mode 100644
index 0000000000..663e3a484f
--- /dev/null
+++ b/sysdeps/aarch64/__mtag_new_tag.S
@@ -0,0 +1,37 @@
+/* Copyright (C) 2020 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/>.  */
+
+#include <sysdep.h>
+
+#ifdef USE_MTAG
+
+	.arch armv8.5-a
+	.arch_extension memtag
+
+/* NB, only supported on variants with 64-bit pointers.  */
+
+#define ptr x0
+#define xset x1
+
+ENTRY(__libc_mtag_new_tag)
+	// Guarantee that the new tag is not the same as now.
+	gmi	xset, ptr, xzr
+	irg	ptr, ptr, xset
+	ret
+END (__libc_mtag_new_tag)
+#endif /* USE_MTAG */