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diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/s390/sys/ucontext.h b/REORG.TODO/sysdeps/unix/sysv/linux/s390/sys/ucontext.h
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+++ b/REORG.TODO/sysdeps/unix/sysv/linux/s390/sys/ucontext.h
@@ -0,0 +1,96 @@
+/* Copyright (C) 2000-2017 Free Software Foundation, Inc.
+   Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+
+#include <bits/types/sigset_t.h>
+#include <bits/sigcontext.h>
+#include <bits/types/stack_t.h>
+
+
+#ifdef __USE_MISC
+# define __ctx(fld) fld
+#else
+# define __ctx(fld) __ ## fld
+#endif
+
+/* Type for a program status word.  */
+typedef struct
+{
+  unsigned long __ctx(mask);
+  unsigned long __ctx(addr);
+} __attribute__ ((__aligned__(8))) __psw_t;
+
+/* Type for a general-purpose register.  */
+typedef unsigned long greg_t;
+
+/* And the whole bunch of them.  We should have used `struct s390_regs',
+   but to avoid name space pollution and since the tradition says that
+   the register set is an array, we make gregset_t a simple array
+   that has the same size as s390_regs.  This is needed for the
+   elf_prstatus structure.  */
+#if __WORDSIZE == 64
+# define __NGREG 27
+#else
+# define __NGREG 36
+#endif
+#ifdef __USE_MISC
+# define NGREG __NGREG
+#endif
+/* Must match kernels psw_t alignment.  */
+typedef greg_t gregset_t[__NGREG] __attribute__ ((__aligned__(8)));
+
+typedef union
+  {
+    double  __ctx(d);
+    float   __ctx(f);
+  } fpreg_t;
+
+/* Register set for the floating-point registers.  */
+typedef struct
+  {
+    unsigned int __ctx(fpc);
+    fpreg_t __ctx(fprs)[16];
+  } fpregset_t;
+
+/* Context to describe whole processor state.  */
+typedef struct
+  {
+    __psw_t __ctx(psw);
+    unsigned long __ctx(gregs)[16];
+    unsigned int __ctx(aregs)[16];
+    fpregset_t __ctx(fpregs);
+  } mcontext_t;
+
+#undef __ctx
+
+/* Userlevel context.  */
+typedef struct ucontext
+  {
+    unsigned long int uc_flags;
+    struct ucontext *uc_link;
+    stack_t uc_stack;
+    mcontext_t uc_mcontext;
+    sigset_t uc_sigmask;
+  } ucontext_t;
+
+
+#endif /* sys/ucontext.h */