1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/arch-pkey.h b/sysdeps/unix/sysv/linux/aarch64/arch-pkey.h
new file mode 100644
index 0000000000..6149b5da7b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/arch-pkey.h
@@ -0,0 +1,53 @@
+/* Helper functions for manipulating memory protection keys.
+   Copyright (C) 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
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _ARCH_PKEY_H
+#define _ARCH_PKEY_H
+
+#include <sys/cdefs.h>
+
+#define S1POE_PERM_NO_ACCESS	0b0000UL
+#define S1POE_PERM_R		0b0001UL
+#define S1POE_PERM_X		0b0010UL
+#define S1POE_PERM_RX		0b0011UL
+#define S1POE_PERM_W		0b0100UL
+#define S1POE_PERM_RW		0b0101UL
+#define S1POE_PERM_WX		0b0110UL
+#define S1POE_PERM_RWX		0b0111UL
+
+#define S1POE_PERM_MASK 	0b1111UL
+
+#define S1POE_BITS_PER_POI      4UL
+
+/* Return the value of the POR_EL0 register.  */
+static __always_inline unsigned long
+pkey_read (void)
+{
+  unsigned long r;
+  __asm__ volatile ("mrs %0, s3_3_c10_c2_4" : "=r" (r));
+  return r;
+}
+
+/* Overwrite the POR_EL0 register with VALUE.  */
+static __always_inline void
+pkey_write (unsigned long value)
+{
+  __asm__ volatile ("msr s3_3_c10_c2_4, %0; isb" : : "r" (value));
+}
+
+#endif /* _ARCH_PKEY_H */