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74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* libc-internal interface for tagged (colored) memory support.
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Copyright (C) 2020-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _GENERIC_LIBC_MTAG_H
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#define _GENERIC_LIBC_MTAG_H 1
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/* Generic bindings for systems that do not support memory tagging. */
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/* Used to ensure additional alignment when objects need to have distinct
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tags. */
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#define __MTAG_GRANULE_SIZE 1
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/* Non-zero if memory obtained via morecore (sbrk) is not tagged. */
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#define __MTAG_SBRK_UNTAGGED 0
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/* Extra flags to pass to mmap() to request a tagged region of memory. */
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#define __MTAG_MMAP_FLAGS 0
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/* Memory tagging target hooks are only called when memory tagging is
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enabled at runtime. The generic definitions here must not be used. */
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void __libc_mtag_link_error (void);
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/* Set the tags for a region of memory, which must have size and alignment
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that are multiples of __MTAG_GRANULE_SIZE. Size cannot be zero. */
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static inline void *
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__libc_mtag_tag_region (void *p, size_t n)
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{
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__libc_mtag_link_error ();
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return p;
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}
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/* Optimized equivalent to __libc_mtag_tag_region followed by memset to 0. */
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static inline void *
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__libc_mtag_tag_zero_region (void *p, size_t n)
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{
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__libc_mtag_link_error ();
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return memset (p, 0, n);
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}
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/* Convert address P to a pointer that is tagged correctly for that
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location. */
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static inline void *
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__libc_mtag_address_get_tag (void *p)
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{
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__libc_mtag_link_error ();
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return p;
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}
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/* Assign a new (random) tag to a pointer P (does not adjust the tag on
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the memory addressed). */
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static inline void *
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__libc_mtag_new_tag (void *p)
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{
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__libc_mtag_link_error ();
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return p;
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}
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#endif /* _GENERIC_LIBC_MTAG_H */
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