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/* 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 _AARCH64_LIBC_MTAG_H
#define _AARCH64_LIBC_MTAG_H 1
#ifndef _LIBC_MTAG
/* Generic bindings for systems that do not support memory tagging. */
#include_next "libc-mtag.h"
#else
/* Used to ensure additional alignment when objects need to have distinct
tags. */
#define __MTAG_GRANULE_SIZE 16
/* Non-zero if memory obtained via morecore (sbrk) is not tagged. */
#define __MTAG_SBRK_UNTAGGED 1
/* Extra flags to pass to mmap to get tagged pages. */
#define __MTAG_MMAP_FLAGS PROT_MTE
/* 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) */
void *__libc_mtag_tag_region (void *, size_t);
/* Optimized equivalent to __libc_mtag_tag_region followed by memset. */
void *__libc_mtag_memset_with_tag(void *, int, size_t);
/* Convert address P to a pointer that is tagged correctly for that
location.
void *__libc_mtag_address_get_tag (void*) */
void *__libc_mtag_address_get_tag(void *);
/* Assign a new (random) tag to a pointer P (does not adjust the tag on
the memory addressed).
void *__libc_mtag_new_tag (void*) */
void *__libc_mtag_new_tag(void *);
#endif /* _LIBC_MTAG */
#endif /* _AARCH64_LIBC_MTAG_H */
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