Introduce <pointer_guard.h>, extracted from <sysdep.h>

This allows us to define a generic no-op version of PTR_MANGLE and
PTR_DEMANGLE.  In the future, we can use PTR_MANGLE and PTR_DEMANGLE
unconditionally in C sources, avoiding an unintended loss of hardening
due to missing include files or unlucky header inclusion ordering.

In i386 and x86_64, we can avoid a <tls.h> dependency in the C
code by using the computed constant from <tcb-offsets.h>.  <sysdep.h>
no longer includes these definitions, so there is no cyclic dependency
anymore when computing the <tcb-offsets.h> constants.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

44 files changed, 760 insertions, 463 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 0000000..b81c907
--- /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 */
diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
index f1853e0..8ba50da 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
@@ -233,49 +233,4 @@
 
 #endif	/* __ASSEMBLER__ */
 
-/* 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
-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 /* linux/aarch64/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S b/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S
index 610f401..566a3b0 100644
--- a/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S
+++ b/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S
@@ -16,6 +16,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <jmpbuf-offsets.h>
 
 
diff --git a/sysdeps/unix/sysv/linux/alpha/pointer_guard.h b/sysdeps/unix/sysv/linux/alpha/pointer_guard.h
new file mode 100644
index 0000000..d4d513d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/pointer_guard.h
@@ -0,0 +1,62 @@
+/* Pointer guard implementation.  Alpha version.
+   Copyright (C) 2006-2022 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 support.  Note that tls access is slow enough that
+   we don't deoptimize things by placing the pointer check value there.  */
+
+#ifdef __ASSEMBLER__
+# if IS_IN (rtld)
+#  define PTR_MANGLE(dst, src, tmp)                             \
+        ldah    tmp, __pointer_chk_guard_local($29) !gprelhigh; \
+        ldq     tmp, __pointer_chk_guard_local(tmp) !gprellow;  \
+        xor     src, tmp, dst
+#  define PTR_MANGLE2(dst, src, tmp)                            \
+        xor     src, tmp, dst
+# elif defined SHARED
+#  define PTR_MANGLE(dst, src, tmp)             \
+        ldq     tmp, __pointer_chk_guard;       \
+        xor     src, tmp, dst
+# else
+#  define PTR_MANGLE(dst, src, tmp)             \
+        ldq     tmp, __pointer_chk_guard_local; \
+        xor     src, tmp, dst
+# endif
+# define PTR_MANGLE2(dst, src, tmp)             \
+        xor     src, tmp, dst
+# define PTR_DEMANGLE(dst, tmp)   PTR_MANGLE(dst, dst, tmp)
+# define PTR_DEMANGLE2(dst, tmp)  PTR_MANGLE2(dst, dst, tmp)
+#else
+# include <stdint.h>
+# if (IS_IN (rtld) \
+      || (!defined SHARED && (IS_IN (libc) \
+                              || IS_IN (libpthread))))
+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)
+# else
+extern uintptr_t __pointer_chk_guard attribute_relro;
+#  define PTR_MANGLE(var) \
+        (var) = (__typeof(var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
+# endif
+# define PTR_DEMANGLE(var)  PTR_MANGLE(var)
+#endif /* ASSEMBLER */
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/alpha/sysdep.h b/sysdeps/unix/sysv/linux/alpha/sysdep.h
index 77ec2b5..0ddcb58 100644
--- a/sysdeps/unix/sysv/linux/alpha/sysdep.h
+++ b/sysdeps/unix/sysv/linux/alpha/sysdep.h
@@ -313,44 +313,4 @@ __LABEL(name)						\
 })
 #endif /* ASSEMBLER */
 
-/* Pointer mangling support.  Note that tls access is slow enough that
-   we don't deoptimize things by placing the pointer check value there.  */
-
-#ifdef __ASSEMBLER__
-# if IS_IN (rtld)
-#  define PTR_MANGLE(dst, src, tmp)				\
-	ldah	tmp, __pointer_chk_guard_local($29) !gprelhigh;	\
-	ldq	tmp, __pointer_chk_guard_local(tmp) !gprellow;	\
-	xor	src, tmp, dst
-#  define PTR_MANGLE2(dst, src, tmp)				\
-	xor	src, tmp, dst
-# elif defined SHARED
-#  define PTR_MANGLE(dst, src, tmp)		\
-	ldq	tmp, __pointer_chk_guard;	\
-	xor	src, tmp, dst
-# else
-#  define PTR_MANGLE(dst, src, tmp)		\
-	ldq	tmp, __pointer_chk_guard_local;	\
-	xor	src, tmp, dst
-# endif
-# define PTR_MANGLE2(dst, src, tmp)		\
-	xor	src, tmp, dst
-# define PTR_DEMANGLE(dst, tmp)   PTR_MANGLE(dst, dst, tmp)
-# define PTR_DEMANGLE2(dst, tmp)  PTR_MANGLE2(dst, dst, tmp)
-#else
-# include <stdint.h>
-# if (IS_IN (rtld) \
-      || (!defined SHARED && (IS_IN (libc) \
-			      || IS_IN (libpthread))))
-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)
-# else
-extern uintptr_t __pointer_chk_guard attribute_relro;
-#  define PTR_MANGLE(var) \
-	(var) = (__typeof(var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
-# endif
-# define PTR_DEMANGLE(var)  PTR_MANGLE(var)
-#endif /* ASSEMBLER */
-
 #endif /* _LINUX_ALPHA_SYSDEP_H  */
diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.h b/sysdeps/unix/sysv/linux/arc/sysdep.h
index d0c1a78..512284a 100644
--- a/sysdeps/unix/sysv/linux/arc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/arc/sysdep.h
@@ -215,10 +215,6 @@ hidden_proto (__syscall_error)
   LOAD_ARGS_6 (nm, arg1, arg2, arg3, arg4, arg5, arg6)	\
   register long int _arg7 __asm__ ("r6") = _tmp7;
 
-/* Pointer mangling not yet supported.  */
-# define PTR_MANGLE(var) (void) (var)
-# define PTR_DEMANGLE(var) (void) (var)
-
 # undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
 # define HAVE_INTERNAL_BRK_ADDR_SYMBOL  1
 
diff --git a/sysdeps/unix/sysv/linux/csky/pointer_guard.h b/sysdeps/unix/sysv/linux/csky/pointer_guard.h
new file mode 100644
index 0000000..ed68322
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/pointer_guard.h
@@ -0,0 +1,68 @@
+/* Pointer obfuscation implenentation.  C-SKY version.
+   Copyright (C) 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
+
+#if (IS_IN (rtld) \
+     || (!defined SHARED && (IS_IN (libc) || IS_IN (libpthread))))
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(dst, src, guard)                   \
+        grs     t0, 1f;                                 \
+1:                                                      \
+        lrw     guard, 1b@GOTPC;                        \
+        addu    t0, guard;                              \
+        lrw     guard, __pointer_chk_guard_local@GOT;   \
+        ldr.w   guard, (t0, guard << 0);                \
+        ldw     guard, (guard, 0);                      \
+        xor     dst, src, guard;
+#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
+#  define PTR_MANGLE2(dst, src, guard) \
+        xor     dst, src, guard
+#  define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard)
+# else
+extern uintptr_t __pointer_chk_guard_local;
+#  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__
+#  define PTR_MANGLE(dst, src, guard)           \
+        grs     t0, 1f;                         \
+1:                                              \
+        lrw     guard, 1b@GOTPC;                \
+        addu    t0, guard;                      \
+        lrw     guard, __pointer_chk_guard@GOT; \
+        ldr.w   guard, (t0, guard << 0);        \
+        ldw     guard, (guard, 0);              \
+        xor     dst, src, guard;
+#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
+#  define PTR_MANGLE2(dst, src, guard) \
+        xor     dst, src, guard
+#  define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard)
+# else
+# include <stdint.h>
+extern uintptr_t __pointer_chk_guard;
+#  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 */
diff --git a/sysdeps/unix/sysv/linux/csky/sysdep.h b/sysdeps/unix/sysv/linux/csky/sysdep.h
index 56c527f..76b09f0 100644
--- a/sysdeps/unix/sysv/linux/csky/sysdep.h
+++ b/sysdeps/unix/sysv/linux/csky/sysdep.h
@@ -466,50 +466,4 @@ __local_syscall_error:				\
 
 #endif /* __ASSEMBLER__ */
 
-/* Pointer mangling support.  */
-#if (IS_IN (rtld) \
-     || (!defined SHARED && (IS_IN (libc) || IS_IN (libpthread))))
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(dst, src, guard)			\
-	grs	t0, 1f;					\
-1:							\
-	lrw	guard, 1b@GOTPC;			\
-	addu	t0, guard;				\
-	lrw	guard, __pointer_chk_guard_local@GOT;	\
-	ldr.w	guard, (t0, guard << 0);		\
-	ldw	guard, (guard, 0);			\
-	xor	dst, src, guard;
-#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
-#  define PTR_MANGLE2(dst, src, guard) \
-	xor	dst, src, guard
-#  define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard)
-# else
-extern uintptr_t __pointer_chk_guard_local;
-#  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__
-#  define PTR_MANGLE(dst, src, guard)		\
-	grs	t0, 1f;				\
-1:						\
-	lrw	guard, 1b@GOTPC;		\
-	addu	t0, guard;			\
-	lrw	guard, __pointer_chk_guard@GOT;	\
-	ldr.w	guard, (t0, guard << 0);	\
-	ldw	guard, (guard, 0);		\
-	xor	dst, src, guard;
-#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
-#  define PTR_MANGLE2(dst, src, guard) \
-	xor	dst, src, guard
-#  define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard)
-# else
-extern uintptr_t __pointer_chk_guard;
-#  define PTR_MANGLE(var) \
-  (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
-#  define PTR_DEMANGLE(var) PTR_MANGLE (var)
-# endif
-#endif
-
 #endif /* linux/csky/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/hppa/sysdep.h b/sysdeps/unix/sysv/linux/hppa/sysdep.h
index 2f339a4..3aef8f5 100644
--- a/sysdeps/unix/sysv/linux/hppa/sysdep.h
+++ b/sysdeps/unix/sysv/linux/hppa/sysdep.h
@@ -470,8 +470,4 @@ L(pre_end):					ASM_LINE_SEP	\
 
 #endif	/* __ASSEMBLER__ */
 
-/* Pointer mangling is not yet supported for HPPA.  */
-#define PTR_MANGLE(var) (void) (var)
-#define PTR_DEMANGLE(var) (void) (var)
-
 #endif /* _LINUX_HPPA_SYSDEP_H */
diff --git a/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S b/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S
index a1cf9a4..f409542 100644
--- a/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S
+++ b/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S
@@ -16,6 +16,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <jmpbuf-offsets.h>
 #include <jmp_buf-ssp.h>
 #include <asm-syntax.h>
diff --git a/sysdeps/unix/sysv/linux/i386/pointer_guard.h b/sysdeps/unix/sysv/linux/i386/pointer_guard.h
new file mode 100644
index 0000000..a2d2a0c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/i386/pointer_guard.h
@@ -0,0 +1,49 @@
+/* Pointer obfuscation implenentation.  i386 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 <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.  Using a global variable
+   is too complicated here since we have no PC-relative addressing mode.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg)       xorl %gs:POINTER_GUARD, reg;                  \
+                                roll $9, reg
+#  define PTR_DEMANGLE(reg)     rorl $9, reg;                                 \
+                                xorl %gs:POINTER_GUARD, reg
+# else
+#  define PTR_MANGLE(var)       asm ("xorl %%gs:%c2, %0\n"                    \
+                                     "roll $9, %0"                            \
+                                     : "=r" (var)                             \
+                                     : "0" (var),                             \
+                                       "i" (POINTER_GUARD))
+#  define PTR_DEMANGLE(var)     asm ("rorl $9, %0\n"                          \
+                                     "xorl %%gs:%c2, %0"                      \
+                                     : "=r" (var)                             \
+                                     : "0" (var),                             \
+                                       "i" (POINTER_GUARD))
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
index 7085f7e..b8be668 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
@@ -446,34 +446,6 @@ struct libc_do_syscall_args
 
 #endif	/* __ASSEMBLER__ */
 
-
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  Using a global variable
-   is too complicated here since we have no PC-relative addressing mode.  */
-#else
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(reg)	xorl %gs:POINTER_GUARD, reg;		      \
-				roll $9, reg
-#  define PTR_DEMANGLE(reg)	rorl $9, reg;				      \
-				xorl %gs:POINTER_GUARD, reg
-# else
-#  define PTR_MANGLE(var)	asm ("xorl %%gs:%c2, %0\n"		      \
-				     "roll $9, %0"			      \
-				     : "=r" (var)			      \
-				     : "0" (var),			      \
-				       "i" (offsetof (tcbhead_t,	      \
-						      pointer_guard)))
-#  define PTR_DEMANGLE(var)	asm ("rorl $9, %0\n"			      \
-				     "xorl %%gs:%c2, %0"		      \
-				     : "=r" (var)			      \
-				     : "0" (var),			      \
-				       "i" (offsetof (tcbhead_t,	      \
-						      pointer_guard)))
-# endif
-#endif
-
 /* Each shadow stack slot takes 4 bytes.  Assuming that each stack
    frame takes 128 bytes, this is used to compute shadow stack size
    from stack size.  */
diff --git a/sysdeps/unix/sysv/linux/ia64/__ia64_longjmp.S b/sysdeps/unix/sysv/linux/ia64/__ia64_longjmp.S
index 9511c15..4ef5129 100644
--- a/sysdeps/unix/sysv/linux/ia64/__ia64_longjmp.S
+++ b/sysdeps/unix/sysv/linux/ia64/__ia64_longjmp.S
@@ -15,6 +15,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <features.h>
 
 LEAF(__ia64_flush_rbs)
diff --git a/sysdeps/unix/sysv/linux/ia64/__longjmp.S b/sysdeps/unix/sysv/linux/ia64/__longjmp.S
index 793dc98..da9653d 100644
--- a/sysdeps/unix/sysv/linux/ia64/__longjmp.S
+++ b/sysdeps/unix/sysv/linux/ia64/__longjmp.S
@@ -31,6 +31,7 @@
 		bits into ar.rnat after setting ar.bspstore. */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <features.h>
 
 #	define	pPos	p6	/* is rotate count positive? */
diff --git a/sysdeps/unix/sysv/linux/ia64/pointer_guard.h b/sysdeps/unix/sysv/linux/ia64/pointer_guard.h
new file mode 100644
index 0000000..8631f39
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ia64/pointer_guard.h
@@ -0,0 +1,44 @@
+/* Pointer obfuscation implenentation.  ia64 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg, tmpreg) \
+        add     tmpreg=-16,r13          \
+        ;;                              \
+        ld8     tmpreg=[tmpreg]         \
+        ;;                              \
+        xor     reg=reg, tmpreg
+#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+  (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/ia64/setjmp.S b/sysdeps/unix/sysv/linux/ia64/setjmp.S
index c29a31f..a978dd4 100644
--- a/sysdeps/unix/sysv/linux/ia64/setjmp.S
+++ b/sysdeps/unix/sysv/linux/ia64/setjmp.S
@@ -63,6 +63,7 @@
 	0x1c0	f31 */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <features.h>
 
 	/* The following two entry points are the traditional entry points: */
diff --git a/sysdeps/unix/sysv/linux/ia64/sysdep.h b/sysdeps/unix/sysv/linux/ia64/sysdep.h
index 14adbdf..b450c6c 100644
--- a/sysdeps/unix/sysv/linux/ia64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/ia64/sysdep.h
@@ -324,24 +324,4 @@
 
 #endif /* not __ASSEMBLER__ */
 
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  */
-#else
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(reg, tmpreg) \
-        add	tmpreg=-16,r13		\
-        ;;				\
-        ld8	tmpreg=[tmpreg]		\
-        ;;				\
-        xor	reg=reg, tmpreg
-#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
-# else
-#  define PTR_MANGLE(var) \
-  (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
-# endif
-#endif
-
 #endif /* linux/ia64/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/loongarch/pointer_guard.h b/sysdeps/unix/sysv/linux/loongarch/pointer_guard.h
new file mode 100644
index 0000000..4b2ed46
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/pointer_guard.h
@@ -0,0 +1,82 @@
+/* Pointer obfuscation implenentation.  LoongArch version.
+   Copyright (C) 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
+
+/* Load a got-relative EXPR into G, using T.
+   Note G and T are register names.  */
+#define LD_GLOBAL(G, EXPR) \
+  la.global G,  EXPR; \
+  REG_L     G,  G,  0;
+
+/* Load a pc-relative EXPR into G, using T.
+   Note G and T are register names.  */
+#define LD_PCREL(G, EXPR) \
+  la.pcrel  G,  EXPR; \
+  REG_L     G,  G,  0;
+
+#if (IS_IN (rtld) \
+     || (!defined SHARED && (IS_IN (libc) \
+     || IS_IN (libpthread))))
+
+#ifdef __ASSEMBLER__
+#define PTR_MANGLE(dst, src, guard) \
+  LD_PCREL (guard, __pointer_chk_guard_local); \
+  PTR_MANGLE2 (dst, src, guard);
+#define PTR_DEMANGLE(dst, src, guard) \
+  LD_PCREL (guard, __pointer_chk_guard_local); \
+  PTR_DEMANGLE2 (dst, src, guard);
+/* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
+#define PTR_MANGLE2(dst, src, guard) \
+  xor  dst, src, guard;
+#define PTR_DEMANGLE2(dst, src, guard) \
+  PTR_MANGLE2 (dst, src, guard);
+#else
+# include <stdint.h>
+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__
+#define PTR_MANGLE(dst, src, guard) \
+  LD_GLOBAL (guard, __pointer_chk_guard); \
+  PTR_MANGLE2 (dst, src, guard);
+#define PTR_DEMANGLE(dst, src, guard) \
+  LD_GLOBAL (guard, __pointer_chk_guard); \
+  PTR_DEMANGLE2 (dst, src, guard);
+/* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
+#define PTR_MANGLE2(dst, src, guard) \
+  xor dst, src, guard;
+#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 */
diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.h b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
index f4a1d23..09f8243 100644
--- a/sysdeps/unix/sysv/linux/loongarch/sysdep.h
+++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
@@ -314,64 +314,4 @@ extern long int __syscall_error (long int neg_errno);
 
 #endif /* ! __ASSEMBLER__ */
 
-/* Pointer mangling is supported for LoongArch.  */
-
-/* Load a got-relative EXPR into G, using T.
-   Note G and T are register names.  */
-#define LD_GLOBAL(G, EXPR) \
-  la.global G,	EXPR; \
-  REG_L	    G,	G,  0;
-
-/* Load a pc-relative EXPR into G, using T.
-   Note G and T are register names.  */
-#define LD_PCREL(G, EXPR) \
-  la.pcrel  G,	EXPR; \
-  REG_L	    G,	G,  0;
-
-#if (IS_IN (rtld) \
-     || (!defined SHARED && (IS_IN (libc) \
-     || IS_IN (libpthread))))
-
-#ifdef __ASSEMBLER__
-#define PTR_MANGLE(dst, src, guard) \
-  LD_PCREL (guard, __pointer_chk_guard_local); \
-  PTR_MANGLE2 (dst, src, guard);
-#define PTR_DEMANGLE(dst, src, guard) \
-  LD_PCREL (guard, __pointer_chk_guard_local); \
-  PTR_DEMANGLE2 (dst, src, guard);
-/* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
-#define PTR_MANGLE2(dst, src, guard) \
-  xor  dst, src, guard;
-#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__
-#define PTR_MANGLE(dst, src, guard) \
-  LD_GLOBAL (guard, __pointer_chk_guard); \
-  PTR_MANGLE2 (dst, src, guard);
-#define PTR_DEMANGLE(dst, src, guard) \
-  LD_GLOBAL (guard, __pointer_chk_guard); \
-  PTR_DEMANGLE2 (dst, src, guard);
-/* Use PTR_MANGLE2 for efficiency if guard is already loaded.  */
-#define PTR_MANGLE2(dst, src, guard) \
-  xor dst, src, guard;
-#define PTR_DEMANGLE2(dst, src, guard) \
-  PTR_MANGLE2 (dst, src, guard);
-#else
-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 /* linux/loongarch/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/m68k/sysdep.h b/sysdeps/unix/sysv/linux/m68k/sysdep.h
index d87892a..0642403 100644
--- a/sysdeps/unix/sysv/linux/m68k/sysdep.h
+++ b/sysdeps/unix/sysv/linux/m68k/sysdep.h
@@ -295,10 +295,6 @@ SYSCALL_ERROR_LABEL:							      \
 
 #endif /* not __ASSEMBLER__ */
 
-/* Pointer mangling is not yet supported for M68K.  */
-#define PTR_MANGLE(var) (void) (var)
-#define PTR_DEMANGLE(var) (void) (var)
-
 /* M68K needs system-supplied DSO to access TLS helpers
    even when statically linked.  */
 #define NEED_STATIC_SYSINFO_DSO 1
diff --git a/sysdeps/unix/sysv/linux/microblaze/sysdep.h b/sysdeps/unix/sysv/linux/microblaze/sysdep.h
index fda78f6..19805f6 100644
--- a/sysdeps/unix/sysv/linux/microblaze/sysdep.h
+++ b/sysdeps/unix/sysv/linux/microblaze/sysdep.h
@@ -304,10 +304,6 @@ SYSCALL_ERROR_LABEL_DCL:                            \
   })
 
 
-/* Pointer mangling is not yet supported for Microblaze.  */
-# define PTR_MANGLE(var) (void) (var)
-# define PTR_DEMANGLE(var) (void) (var)
-
 #undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
 #define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
 
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
index a2a93bc..0ef410c 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
@@ -337,8 +337,4 @@ libc_hidden_proto (__mips_syscall7, nomips16)
 
 #endif /* __ASSEMBLER__ */
 
-/* Pointer mangling is not yet supported for MIPS.  */
-#define PTR_MANGLE(var) (void) (var)
-#define PTR_DEMANGLE(var) (void) (var)
-
 #endif /* linux/mips/mips32/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h
index 2c16a67..e362f15 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h
@@ -300,8 +300,4 @@ typedef long int __syscall_arg_t;
 
 #endif /* __ASSEMBLER__ */
 
-/* Pointer mangling is not yet supported for MIPS.  */
-#define PTR_MANGLE(var) (void) (var)
-#define PTR_DEMANGLE(var) (void) (var)
-
 #endif /* linux/mips/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/nios2/pointer_guard.h b/sysdeps/unix/sysv/linux/nios2/pointer_guard.h
new file mode 100644
index 0000000..da17809
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nios2/pointer_guard.h
@@ -0,0 +1,40 @@
+/* Pointer obfuscation implenentation.  Nios II version.
+   Copyright (C) 2015-2022 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE_GUARD(guard) ldw guard, POINTER_GUARD(r23)
+#  define PTR_MANGLE(dst, src, guard) xor dst, src, guard
+#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/nios2/sysdep.h b/sysdeps/unix/sysv/linux/nios2/sysdep.h
index 5fe960c..46667b9 100644
--- a/sysdeps/unix/sysv/linux/nios2/sysdep.h
+++ b/sysdeps/unix/sysv/linux/nios2/sysdep.h
@@ -220,21 +220,4 @@
 
 #endif /* __ASSEMBLER__ */
 
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  */
-#else
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE_GUARD(guard) ldw guard, POINTER_GUARD(r23)
-#  define PTR_MANGLE(dst, src, guard) xor dst, src, guard
-#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
-# else
-#  define PTR_MANGLE(var) \
-  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
-# endif
-#endif
-
-
 #endif /* linux/nios2/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/or1k/sysdep.h b/sysdeps/unix/sysv/linux/or1k/sysdep.h
index 941c934..b1fdf2a 100644
--- a/sysdeps/unix/sysv/linux/or1k/sysdep.h
+++ b/sysdeps/unix/sysv/linux/or1k/sysdep.h
@@ -119,10 +119,6 @@ L(pseudo_end): \
 
 extern long int __syscall_error (long int neg_errno);
 
-/* Pointer mangling is not yet supported for or1k.  */
-#define PTR_MANGLE(var) (void) (var)
-#define PTR_DEMANGLE(var) (void) (var)
-
 #undef INTERNAL_SYSCALL
 #define INTERNAL_SYSCALL(name, nr, args...) \
 	INTERNAL_SYSCALL_NCS (SYS_ify (name), nr, args)
diff --git a/sysdeps/unix/sysv/linux/powerpc/pointer_guard.h b/sysdeps/unix/sysv/linux/powerpc/pointer_guard.h
new file mode 100644
index 0000000..5961793
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/pointer_guard.h
@@ -0,0 +1,55 @@
+/* Pointer obfuscation implenentation.  PowerpC 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+# ifdef __ASSEMBLER__
+#  if defined(__PPC64__) || defined(__powerpc64__)
+#   define LOAD  ld
+#   define TPREG r13
+#  else
+#   define LOAD  lwz
+#   define TPREG r2
+#  endif
+#  define PTR_MANGLE(reg, tmpreg) \
+        LOAD    tmpreg,POINTER_GUARD(TPREG); \
+        xor     reg,tmpreg,reg
+#  define PTR_MANGLE2(reg, tmpreg) \
+        xor     reg,tmpreg,reg
+#  define PTR_MANGLE3(destreg, reg, tmpreg) \
+        LOAD    tmpreg,POINTER_GUARD(TPREG); \
+        xor     destreg,tmpreg,reg
+#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
+#  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
+#  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/powerpc/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
index 4fb135a..9e44818 100644
--- a/sysdeps/unix/sysv/linux/powerpc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
@@ -207,38 +207,6 @@
 #define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 #define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 
-
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  */
-#else
-# ifdef __ASSEMBLER__
-#  if defined(__PPC64__) || defined(__powerpc64__)
-#   define LOAD  ld
-#   define TPREG r13
-#  else
-#   define LOAD  lwz
-#   define TPREG r2
-#  endif
-#  define PTR_MANGLE(reg, tmpreg) \
-	LOAD	tmpreg,POINTER_GUARD(TPREG); \
-	xor	reg,tmpreg,reg
-#  define PTR_MANGLE2(reg, tmpreg) \
-	xor	reg,tmpreg,reg
-#  define PTR_MANGLE3(destreg, reg, tmpreg) \
-	LOAD	tmpreg,POINTER_GUARD(TPREG); \
-	xor	destreg,tmpreg,reg
-#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
-#  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
-#  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
-# else
-#  define PTR_MANGLE(var) \
-  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
-# endif
-#endif
-
 /* List of system calls which are supported as vsyscalls.  */
 #define VDSO_NAME  "LINUX_2.6.15"
 #define VDSO_HASH  123718565
diff --git a/sysdeps/unix/sysv/linux/riscv/sysdep.h b/sysdeps/unix/sysv/linux/riscv/sysdep.h
index 9b03b10..c9af888 100644
--- a/sysdeps/unix/sysv/linux/riscv/sysdep.h
+++ b/sysdeps/unix/sysv/linux/riscv/sysdep.h
@@ -357,8 +357,4 @@ extern long int __syscall_error (long int neg_errno);
 
 #endif /* ! __ASSEMBLER__ */
 
-/* Pointer mangling is not supported.  */
-#define PTR_MANGLE(var) (void) (var)
-#define PTR_DEMANGLE(var) (void) (var)
-
 #endif /* linux/riscv/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/pointer_guard.h b/sysdeps/unix/sysv/linux/s390/s390-32/pointer_guard.h
new file mode 100644
index 0000000..0e85d4c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/pointer_guard.h
@@ -0,0 +1,45 @@
+/* Pointer obfuscation implenentation.  s390 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+/* For the time being just use stack_guard rather than a separate
+   pointer_guard.  */
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg, tmpreg) \
+  ear     tmpreg,%a0;                   \
+  x       reg,STACK_GUARD(tmpreg)
+#  define PTR_MANGLE2(reg, tmpreg) \
+  x       reg,STACK_GUARD(tmpreg)
+#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+  (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
index e41106b..a24fde7 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
@@ -177,25 +177,4 @@
 
 #endif /* __ASSEMBLER__ */
 
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  */
-#else
-/* For the time being just use stack_guard rather than a separate
-   pointer_guard.  */
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(reg, tmpreg) \
-  ear     tmpreg,%a0;			\
-  x       reg,STACK_GUARD(tmpreg)
-#  define PTR_MANGLE2(reg, tmpreg) \
-  x       reg,STACK_GUARD(tmpreg)
-#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
-# else
-#  define PTR_MANGLE(var) \
-  (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
-# endif
-#endif
-
 #endif /* _LINUX_S390_SYSDEP_H */
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/pointer_guard.h b/sysdeps/unix/sysv/linux/s390/s390-64/pointer_guard.h
new file mode 100644
index 0000000..5285456
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/pointer_guard.h
@@ -0,0 +1,47 @@
+/* Pointer obfuscation implenentation.  s390x 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+/* For the time being just use stack_guard rather than a separate
+   pointer_guard.  */
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg, tmpreg) \
+  ear     tmpreg,%a0;			\
+  sllg    tmpreg,tmpreg,32;		\
+  ear     tmpreg,%a1;			\
+  xg      reg,STACK_GUARD(tmpreg)
+#  define PTR_MANGLE2(reg, tmpreg) \
+  xg      reg,STACK_GUARD(tmpreg)
+#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+  (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
index 150e339..79bc0fa 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
@@ -175,27 +175,4 @@
 
 #endif /* __ASSEMBLER__ */
 
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  */
-#else
-/* For the time being just use stack_guard rather than a separate
-   pointer_guard.  */
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(reg, tmpreg) \
-  ear     tmpreg,%a0;			\
-  sllg    tmpreg,tmpreg,32;		\
-  ear     tmpreg,%a1;			\
-  xg      reg,STACK_GUARD(tmpreg)
-#  define PTR_MANGLE2(reg, tmpreg) \
-  xg      reg,STACK_GUARD(tmpreg)
-#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
-# else
-#  define PTR_MANGLE(var) \
-  (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
-# endif
-#endif
-
 #endif /* _LINUX_S390_SYSDEP_H */
diff --git a/sysdeps/unix/sysv/linux/sh/____longjmp_chk.S b/sysdeps/unix/sysv/linux/sh/____longjmp_chk.S
index e821e15..cf69926 100644
--- a/sysdeps/unix/sysv/linux/sh/____longjmp_chk.S
+++ b/sysdeps/unix/sysv/linux/sh/____longjmp_chk.S
@@ -16,6 +16,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 
 #include <sigaltstack-offsets.h>
 
diff --git a/sysdeps/unix/sysv/linux/sh/pointer_guard.h b/sysdeps/unix/sysv/linux/sh/pointer_guard.h
new file mode 100644
index 0000000..32a571d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sh/pointer_guard.h
@@ -0,0 +1,43 @@
+/* Pointer obfuscation implenentation.  Generic (no-op) 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  Using a global variable
+   is too complicated here since we have no PC-relative addressing mode.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg, tmp) \
+     stc gbr,tmp; mov.l @(POINTER_GUARD,tmp),tmp; xor tmp,reg
+#  define PTR_MANGLE2(reg, tmp) xor tmp,reg
+#  define PTR_DEMANGLE(reg, tmp)        PTR_MANGLE (reg, tmp)
+#  define PTR_DEMANGLE2(reg, tmp)       PTR_MANGLE2 (reg, tmp)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+     (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/sh/sysdep.h b/sysdeps/unix/sysv/linux/sh/sysdep.h
index e9e13cd..a2f43f6 100644
--- a/sysdeps/unix/sysv/linux/sh/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sh/sysdep.h
@@ -315,23 +315,4 @@
 
 #endif	/* __ASSEMBLER__ */
 
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  Using a global variable
-   is too complicated here since we have no PC-relative addressing mode.  */
-#else
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(reg, tmp) \
-     stc gbr,tmp; mov.l @(POINTER_GUARD,tmp),tmp; xor tmp,reg
-#  define PTR_MANGLE2(reg, tmp)	xor tmp,reg
-#  define PTR_DEMANGLE(reg, tmp)	PTR_MANGLE (reg, tmp)
-#  define PTR_DEMANGLE2(reg, tmp)	PTR_MANGLE2 (reg, tmp)
-# else
-#  define PTR_MANGLE(var) \
-     (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
-# endif
-#endif
-
 #endif /* linux/sh/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S b/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S
index 8e8cb4d..ad23840b 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S
@@ -16,6 +16,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <jmpbuf-offsets.h>
 
 #define ENV(base,reg) [%base + (reg * 4)]
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/pointer_guard.h b/sysdeps/unix/sysv/linux/sparc/sparc32/pointer_guard.h
new file mode 100644
index 0000000..4063513
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/pointer_guard.h
@@ -0,0 +1,44 @@
+/* Pointer obfuscation implenentation.  32-bit SPARC version.
+   Copyright (C) 2006-2022 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(dreg, reg, tmpreg) \
+  ld    [%g7 + POINTER_GUARD], tmpreg; \
+  xor   reg, tmpreg, dreg
+#  define PTR_DEMANGLE(dreg, reg, tmpreg) PTR_MANGLE (dreg, reg, tmpreg)
+#  define PTR_MANGLE2(dreg, reg, tmpreg) \
+  xor   reg, tmpreg, dreg
+#  define PTR_DEMANGLE2(dreg, reg, tmpreg) PTR_MANGLE2 (dreg, reg, tmpreg)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h b/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
index 032608a..1783af8 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
@@ -125,24 +125,4 @@ ENTRY(name);					\
 
 #endif	/* __ASSEMBLER__ */
 
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  */
-#else
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(dreg, reg, tmpreg) \
-  ld	[%g7 + POINTER_GUARD], tmpreg; \
-  xor	reg, tmpreg, dreg
-#  define PTR_DEMANGLE(dreg, reg, tmpreg) PTR_MANGLE (dreg, reg, tmpreg)
-#  define PTR_MANGLE2(dreg, reg, tmpreg) \
-  xor	reg, tmpreg, dreg
-#  define PTR_DEMANGLE2(dreg, reg, tmpreg) PTR_MANGLE2 (dreg, reg, tmpreg)
-# else
-#  define PTR_MANGLE(var) \
-  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
-# endif
-#endif
-
 #endif /* linux/sparc/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/pointer_guard.h b/sysdeps/unix/sysv/linux/sparc/sparc64/pointer_guard.h
new file mode 100644
index 0000000..7865e87
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/pointer_guard.h
@@ -0,0 +1,44 @@
+/* Pointer obfuscation implenentation.  64-bit SPARC version.
+   Copyright (C) 2006-2022 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
+
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  */
+# include <sysdeps/generic/pointer_guard.h>
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(dreg, reg, tmpreg) \
+  ldx   [%g7 + POINTER_GUARD], tmpreg; \
+  xor   reg, tmpreg, dreg
+#  define PTR_DEMANGLE(dreg, reg, tmpreg) PTR_MANGLE (dreg, reg, tmpreg)
+#  define PTR_MANGLE2(dreg, reg, tmpreg) \
+  xor   reg, tmpreg, dreg
+#  define PTR_DEMANGLE2(dreg, reg, tmpreg) PTR_MANGLE2 (dreg, reg, tmpreg)
+# else
+#  include <stdint.h>
+#  include <tls.h>
+#  define PTR_MANGLE(var) \
+  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
+# endif
+#endif
+
+#endif /* POINTER_GUARD_H */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h b/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h
index 4aaa291..4ae22ae 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h
@@ -127,24 +127,4 @@ ENTRY(name);					\
    register windows.  So if you poke stack memory directly you add this.  */
 #define STACK_BIAS	2047
 
-/* Pointer mangling support.  */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
-   earlier than the descriptor is initialized.  */
-#else
-# ifdef __ASSEMBLER__
-#  define PTR_MANGLE(dreg, reg, tmpreg) \
-  ldx	[%g7 + POINTER_GUARD], tmpreg; \
-  xor	reg, tmpreg, dreg
-#  define PTR_DEMANGLE(dreg, reg, tmpreg) PTR_MANGLE (dreg, reg, tmpreg)
-#  define PTR_MANGLE2(dreg, reg, tmpreg) \
-  xor	reg, tmpreg, dreg
-#  define PTR_DEMANGLE2(dreg, reg, tmpreg) PTR_MANGLE2 (dreg, reg, tmpreg)
-# else
-#  define PTR_MANGLE(var) \
-  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-#  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
-# endif
-#endif
-
 #endif /* linux/sparc64/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
index ffdf462..5ff275c 100644
--- a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
+++ b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
@@ -16,6 +16,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <pointer_guard.h>
 #include <jmpbuf-offsets.h>
 #include <asm-syntax.h>
 #include <stap-probe.h>
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 0000000..2df3912
--- /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 */
diff --git a/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
index 740abef..5e4d782 100644
--- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
@@ -381,46 +381,6 @@
 
 #endif	/* __ASSEMBLER__ */
 
-
-/* Pointer mangling support.  */
-#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" (offsetof (tcbhead_t,	      \
-						      pointer_guard)))
-#  define PTR_DEMANGLE(var)	asm ("ror $2*" LP_SIZE "+1, %0\n"	      \
-				     "xor %%fs:%c2, %0"			      \
-				     : "=r" (var)			      \
-				     : "0" (var),			      \
-				       "i" (offsetof (tcbhead_t,	      \
-						      pointer_guard)))
-# endif
-#endif
-
 /* How to pass the off{64}_t argument on p{readv,writev}{64}.  */
 #undef LO_HI_LONG
 #define LO_HI_LONG(val) (val), 0