1 files changed, 61 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/pointer_guard.h b/sysdeps/unix/sysv/linux/x86_64/pointer_guard.h
new file mode 100644
index 0000000000..2df3912897
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/pointer_guard.h
@@ -0,0 +1,61 @@
+/* Pointer obfuscation implenentation.  x86-64 version.
+   Copyright (C) 2005-2022 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
+
+#include <x86-lp_size.h>
+#include <tcb-offsets.h>
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg)       xor __pointer_chk_guard_local(%rip), reg;    \
+                                rol $2*LP_SIZE+1, reg
+#  define PTR_DEMANGLE(reg)     ror $2*LP_SIZE+1, reg;                       \
+                                xor __pointer_chk_guard_local(%rip), reg
+# else
+#  define PTR_MANGLE(reg)       asm ("xor __pointer_chk_guard_local(%%rip), %0\n" \
+                                     "rol $2*" LP_SIZE "+1, %0"                   \
+                                     : "=r" (reg) : "0" (reg))
+#  define PTR_DEMANGLE(reg)     asm ("ror $2*" LP_SIZE "+1, %0\n"                 \
+                                     "xor __pointer_chk_guard_local(%%rip), %0"   \
+                                     : "=r" (reg) : "0" (reg))
+# endif
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg)       xor %fs:POINTER_GUARD, reg;                   \
+                                rol $2*LP_SIZE+1, reg
+#  define PTR_DEMANGLE(reg)     ror $2*LP_SIZE+1, reg;                        \
+                                xor %fs:POINTER_GUARD, reg
+# else
+#  define PTR_MANGLE(var)       asm ("xor %%fs:%c2, %0\n"                     \
+                                     "rol $2*" LP_SIZE "+1, %0"               \
+                                     : "=r" (var)                             \
+                                     : "0" (var),                             \
+                                       "i" (POINTER_GUARD))
+#  define PTR_DEMANGLE(var)     asm ("ror $2*" LP_SIZE "+1, %0\n"             \
+                                     "xor %%fs:%c2, %0"                       \
+                                     : "=r" (var)                             \
+                                     : "0" (var),                             \
+                                       "i" (POINTER_GUARD))
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */