diff --git a/sysdeps/csky/atomic-machine.h b/sysdeps/csky/atomic-machine.h
new file mode 100644
index 0000000..0205f83
--- /dev/null
+++ b/sysdeps/csky/atomic-machine.h
@@ -0,0 +1,77 @@
+/* Atomic operations.  C-SKY version.
+   Copyright (C) 2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __CSKY_ATOMIC_H_
+#define __CSKY_ATOMIC_H_
+
+#include <stdint.h>
+
+typedef int32_t atomic32_t;
+typedef uint32_t uatomic32_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+#define __HAVE_64B_ATOMICS 0
+#define USE_ATOMIC_COMPILER_BUILTINS 1
+#define ATOMIC_EXCHANGE_USES_CAS 1
+
+#define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
+  ({                                                                    \
+    typeof (*mem) __oldval = (oldval);                                  \
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
+                                  model, __ATOMIC_RELAXED);             \
+  })
+
+#define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
+  (abort (), (__typeof (*mem)) 0)
+
+#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
+  (abort (), (__typeof (*mem)) 0)
+
+#define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
+  ({                                                                    \
+    typeof (*mem) __oldval = (oldval);                                  \
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
+                                 model, __ATOMIC_RELAXED);              \
+    __oldval;                                                           \
+  })
+
+#define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
+  (abort (), (__typeof (*mem)) 0)
+
+#define atomic_compare_and_exchange_bool_acq(mem, new, old)		\
+  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,		\
+			mem, new, old, __ATOMIC_ACQUIRE)
+
+#define atomic_compare_and_exchange_val_acq(mem, new, old)		\
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,		\
+		       mem, new, old, __ATOMIC_ACQUIRE)
+
+#endif /* atomic-machine.h */
diff --git a/sysdeps/csky/nptl/bits/pthreadtypes-arch.h b/sysdeps/csky/nptl/bits/pthreadtypes-arch.h
new file mode 100644
index 0000000..fa04db0
--- /dev/null
+++ b/sysdeps/csky/nptl/bits/pthreadtypes-arch.h
@@ -0,0 +1,70 @@
+/* Machine-specific pthread type layouts.  C-SKY version.
+   Copyright (C) 2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_PTHREADTYPES_ARCH_H
+#define _BITS_PTHREADTYPES_ARCH_H	1
+
+#include <endian.h>
+
+#define __SIZEOF_PTHREAD_ATTR_T			36
+#define __SIZEOF_PTHREAD_MUTEX_T		24
+#define __SIZEOF_PTHREAD_MUTEXATTR_T		4
+#define __SIZEOF_PTHREAD_COND_T			48
+#define __SIZEOF_PTHREAD_CONDATTR_T		4
+#define __SIZEOF_PTHREAD_RWLOCK_T		32
+#define __SIZEOF_PTHREAD_RWLOCKATTR_T		8
+#define __SIZEOF_PTHREAD_BARRIER_T		20
+#define __SIZEOF_PTHREAD_BARRIERATTR_T		4
+
+/* Data structure for mutex handling.  */
+#define __PTHREAD_COMPAT_PADDING_MID
+#define __PTHREAD_COMPAT_PADDING_END
+#define __PTHREAD_MUTEX_LOCK_ELISION		0
+#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND	1
+#define __PTHREAD_MUTEX_USE_UNION		1
+
+#define __LOCK_ALIGNMENT
+#define __ONCE_ALIGNMENT
+
+/* Paddings in this structure are not strictly necessary on C-SKY.
+   They are left for extensibility as most other architecture do so.  */
+struct __pthread_rwlock_arch_t
+{
+  unsigned int __readers;
+  unsigned int __writers;
+  unsigned int __wrphase_futex;
+  unsigned int __writers_futex;
+  unsigned int __pad3;
+  unsigned int __pad4;
+#if __BYTE_ORDER == __BIG_ENDIAN
+  unsigned char __pad1;
+  unsigned char __pad2;
+  unsigned char __shared;
+  unsigned char __flags;
+#else
+  unsigned char __flags;
+  unsigned char __shared;
+  unsigned char __pad1;
+  unsigned char __pad2;
+#endif
+  int __cur_writer;
+};
+
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
+#endif
diff --git a/sysdeps/csky/nptl/bits/semaphore.h b/sysdeps/csky/nptl/bits/semaphore.h
new file mode 100644
index 0000000..0b13f59
--- /dev/null
+++ b/sysdeps/csky/nptl/bits/semaphore.h
@@ -0,0 +1,35 @@
+/* Machine-specific POSIX semaphore type layouts.  C-SKY version.
+   Copyright (C) 2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SEMAPHORE_H
+# error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
+#endif
+
+
+#define __SIZEOF_SEM_T	16
+
+
+/* Value returned if `sem_open' failed.  */
+#define SEM_FAILED	((sem_t *) 0)
+
+
+typedef union
+{
+  char __size[__SIZEOF_SEM_T];
+  long int __align;
+} sem_t;
diff --git a/sysdeps/csky/nptl/pthread-offsets.h b/sysdeps/csky/nptl/pthread-offsets.h
new file mode 100644
index 0000000..9617354
--- /dev/null
+++ b/sysdeps/csky/nptl/pthread-offsets.h
@@ -0,0 +1,5 @@
+#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
+#define __PTHREAD_MUTEX_KIND_OFFSET     12
+#define __PTHREAD_MUTEX_SPINS_OFFSET    20
+#define __PTHREAD_MUTEX_ELISION_OFFSET  22
+#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/csky/nptl/pthreaddef.h b/sysdeps/csky/nptl/pthreaddef.h
new file mode 100644
index 0000000..f69fbc0
--- /dev/null
+++ b/sysdeps/csky/nptl/pthreaddef.h
@@ -0,0 +1,32 @@
+/* pthread machine parameter definitions.  C-SKY version.
+   Copyright (C) 2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+/* Default stack size.  */
+#define ARCH_STACK_DEFAULT_SIZE	(2 * 1024 * 1024)
+
+/* Required stack pointer alignment at beginning.  */
+#define STACK_ALIGN		8
+
+/* Minimal stack size after allocating thread descriptor and guard size.  */
+#define MINIMAL_REST_STACK	2048
+
+/* Alignment requirement for TCB.  */
+#define TCB_ALIGNMENT		8
+
+/* Location of current stack frame.  */
+#define CURRENT_STACK_FRAME	__builtin_frame_address (0)
