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/* libc-internal interface for tagged (colored) memory support.
Copyright (C) 2020-2024 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 USE_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 (void *, size_t);
/* Optimized equivalent to __libc_mtag_tag_region followed by memset to 0. */
void *__libc_mtag_tag_zero_region (void *, size_t);
/* Convert address P to a pointer that is tagged correctly for that
location. */
static __always_inline void *
__libc_mtag_address_get_tag (void *p)
{
register void *x0 asm ("x0") = p;
asm (".inst 0xd9600000 /* ldg x0, [x0] */" : "+r" (x0));
return x0;
}
/* Assign a new (random) tag to a pointer P (does not adjust the tag on
the memory addressed). */
static __always_inline void *
__libc_mtag_new_tag (void *p)
{
register void *x0 asm ("x0") = p;
register unsigned long x1 asm ("x1");
/* Guarantee that the new tag is not the same as now. */
asm (".inst 0x9adf1401 /* gmi x1, x0, xzr */\n"
".inst 0x9ac11000 /* irg x0, x0, x1 */" : "+r" (x0), "=r" (x1));
return x0;
}
#endif /* USE_MTAG */
#endif /* _AARCH64_LIBC_MTAG_H */
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