1 files changed, 68 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/pointer_guard.h b/sysdeps/unix/sysv/linux/aarch64/pointer_guard.h
new file mode 100644
index 0000000000..b81c9075f3
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/pointer_guard.h
@@ -0,0 +1,68 @@
+/* Pointer guard implementation.  AArch64 version.
+   Copyright (C) 2014-2022 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 POINTER_GUARD_H
+#define POINTER_GUARD_H
+
+/* Pointer mangling is supported for AArch64.  */
+#if (IS_IN (rtld) \
+     || (!defined SHARED && (IS_IN (libc) \
+                             || IS_IN (libpthread))))
+# ifdef __ASSEMBLER__
+/* Note, dst, src, guard, and tmp are all register numbers rather than
+   register names so they will work with both ILP32 and LP64. */
+#  define PTR_MANGLE(dst, src, guard, tmp)                                \
+  LDST_PCREL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard_local)); \
+  PTR_MANGLE2 (dst, src, guard)
+/* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
+#  define PTR_MANGLE2(dst, src, guard)\
+  eor x##dst, x##src, x##guard
+#  define PTR_DEMANGLE(dst, src, guard, tmp)\
+  PTR_MANGLE (dst, src, guard, tmp)
+#  define PTR_DEMANGLE2(dst, src, guard)\
+  PTR_MANGLE2 (dst, src, guard)
+# else
+extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
+#  define PTR_MANGLE(var) \
+  (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#else
+# ifdef __ASSEMBLER__
+/* Note, dst, src, guard, and tmp are all register numbers rather than
+   register names so they will work with both ILP32 and LP64. */
+#  define PTR_MANGLE(dst, src, guard, tmp)                             \
+  LDST_GLOBAL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard));   \
+  PTR_MANGLE2 (dst, src, guard)
+/* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
+#  define PTR_MANGLE2(dst, src, guard)\
+  eor x##dst, x##src, x##guard
+#  define PTR_DEMANGLE(dst, src, guard, tmp)\
+  PTR_MANGLE (dst, src, guard, tmp)
+#  define PTR_DEMANGLE2(dst, src, guard)\
+  PTR_MANGLE2 (dst, src, guard)
+# else
+#  include <stdint.h>
+extern uintptr_t __pointer_chk_guard attribute_relro;
+#  define PTR_MANGLE(var) \
+  (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
+#  define PTR_DEMANGLE(var) PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */