1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/generic/libc-mtag.h b/sysdeps/generic/libc-mtag.h
new file mode 100644
index 0000000000..07f0203253
--- /dev/null
+++ b/sysdeps/generic/libc-mtag.h
@@ -0,0 +1,52 @@
+/* libc-internal interface for tagged (colored) memory support.
+   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/>.  */
+
+#ifndef _GENERIC_LIBC_MTAG_H
+#define _GENERIC_LIBC_MTAG_H 1
+
+/* Generic bindings for systems that do not support memory tagging.  */
+
+/* Used to ensure additional alignment when objects need to have distinct
+   tags.  */
+#define __MTAG_GRANULE_SIZE 1
+
+/* Non-zero if memory obtained via morecore (sbrk) is not tagged.  */
+#define __MTAG_SBRK_UNTAGGED 0
+
+/* Extra flags to pass to mmap() to request a tagged region of memory.  */
+#define __MTAG_MMAP_FLAGS 0
+
+/* Set the tags for a region of memory, which must have size and alignment
+   that are multiples of __MTAG_GRANULE_SIZE.  Size cannot be zero.
+   void *__libc_mtag_tag_region (const void *, size_t)  */
+#define __libc_mtag_tag_region(p, s) (p)
+
+/* Optimized equivalent to __libc_mtag_tag_region followed by memset.  */
+#define __libc_mtag_memset_with_tag memset
+
+/* Convert address P to a pointer that is tagged correctly for that
+   location.
+   void *__libc_mtag_address_get_tag (void*)  */
+#define __libc_mtag_address_get_tag(p) (p)
+
+/* Assign a new (random) tag to a pointer P (does not adjust the tag on
+   the memory addressed).
+   void *__libc_mtag_new_tag (void*)  */
+#define __libc_mtag_new_tag(p) (p)
+
+#endif /* _GENERIC_LIBC_MTAG_H */