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c076a0bc69
The memset api is suboptimal and does not provide much benefit. Memory tagging only needs a zeroing memset (and only for memory that's sized and aligned to multiples of the tag granule), so change the internal api and the target hooks accordingly. This is to simplify the implementation of the target hook. Reviewed-by: DJ Delorie <dj@redhat.com>
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) 2020-2021 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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