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linux: Add compatibility definitions to sys/prctl.h for MTE

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Older versions of the Linux kernel headers obviously lack support for
memory tagging, but we still want to be able to build in support when
using those (obviously it can't be enabled on such systems).

The linux kernel extensions are made to the platform-independent
header (linux/prctl.h), so this patch takes a similar approach.
This commit is contained in:
Richard Earnshaw 2020-12-21 15:03:03 +00:00
parent 3784dfc098
commit 0d1bafdcb6
1 changed files with 18 additions and 0 deletions
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18
sysdeps/unix/sysv/linux/sys/prctl.h
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@ -21,6 +21,24 @@
#include <features.h>
#include <linux/prctl.h> /* The magic values come from here */
/* Recent extensions to linux which may post-date the kernel headers
we're picking up... */
/* Memory tagging control operations (for AArch64). */
#ifndef PR_TAGGED_ADDR_ENABLE
# define PR_TAGGED_ADDR_ENABLE (1UL << 8)
#endif
#ifndef PR_MTE_TCF_SHIFT
# define PR_MTE_TCF_SHIFT 1
# define PR_MTE_TCF_NONE (0UL << PR_MTE_TCF_SHIFT)
# define PR_MTE_TCF_SYNC (1UL << PR_MTE_TCF_SHIFT)
# define PR_MTE_TCF_ASYNC (2UL << PR_MTE_TCF_SHIFT)
# define PR_MTE_TCF_MASK (3UL << PR_MTE_TCF_SHIFT)
# define PR_MTE_TAG_SHIFT 3
# define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT)
#endif
__BEGIN_DECLS
/* Control process execution. */