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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 */