diff --git a/libcpu/memory-access.h b/libcpu/memory-access.h
new file mode 100644
index 0000000..779825f
--- /dev/null
+++ b/libcpu/memory-access.h
@@ -0,0 +1,182 @@
+/* Unaligned memory access functionality.
+   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2008 Red Hat, Inc.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils 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
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef _MEMORY_ACCESS_H
+#define _MEMORY_ACCESS_H 1
+
+#include <byteswap.h>
+#include <endian.h>
+#include <limits.h>
+#include <stdint.h>
+
+
+/* When loading this file we require the macro MACHINE_ENCODING to be
+   defined to signal the endianness of the architecture which is
+   defined.  */
+#ifndef MACHINE_ENCODING
+# error "MACHINE_ENCODING needs to be defined"
+#endif
+#if MACHINE_ENCODING != __BIG_ENDIAN && MACHINE_ENCODING != __LITTLE_ENDIAN
+# error "MACHINE_ENCODING must signal either big or little endian"
+#endif
+
+
+/* We use simple memory access functions in case the hardware allows it.
+   The caller has to make sure we don't have alias problems.  */
+#if ALLOW_UNALIGNED
+
+# define read_2ubyte_unaligned(Addr) \
+  (unlikely (MACHINE_ENCODING != __BYTE_ORDER)				      \
+   ? bswap_16 (*((const uint16_t *) (Addr)))				      \
+   : *((const uint16_t *) (Addr)))
+# define read_2sbyte_unaligned(Addr) \
+  (unlikely (MACHINE_ENCODING != __BYTE_ORDER)				      \
+   ? (int16_t) bswap_16 (*((const int16_t *) (Addr)))			      \
+   : *((const int16_t *) (Addr)))
+
+# define read_4ubyte_unaligned_noncvt(Addr) \
+   *((const uint32_t *) (Addr))
+# define read_4ubyte_unaligned(Addr) \
+  (unlikely (MACHINE_ENCODING != __BYTE_ORDER)				      \
+   ? bswap_32 (*((const uint32_t *) (Addr)))				      \
+   : *((const uint32_t *) (Addr)))
+# define read_4sbyte_unaligned(Addr) \
+  (unlikely (MACHINE_ENCODING != __BYTE_ORDER)				      \
+   ? (int32_t) bswap_32 (*((const int32_t *) (Addr)))			      \
+   : *((const int32_t *) (Addr)))
+
+# define read_8ubyte_unaligned(Addr) \
+  (unlikely (MACHINE_ENCODING != __BYTE_ORDER)				      \
+   ? bswap_64 (*((const uint64_t *) (Addr)))				      \
+   : *((const uint64_t *) (Addr)))
+# define read_8sbyte_unaligned(Addr) \
+  (unlikely (MACHINE_ENCODING != __BYTE_ORDER)				      \
+   ? (int64_t) bswap_64 (*((const int64_t *) (Addr)))			      \
+   : *((const int64_t *) (Addr)))
+
+#else
+
+union unaligned
+  {
+    void *p;
+    uint16_t u2;
+    uint32_t u4;
+    uint64_t u8;
+    int16_t s2;
+    int32_t s4;
+    int64_t s8;
+  } attribute_packed;
+
+static inline uint16_t
+read_2ubyte_unaligned (const void *p)
+{
+  const union unaligned *up = p;
+  if (MACHINE_ENCODING != __BYTE_ORDER)
+    return bswap_16 (up->u2);
+  return up->u2;
+}
+static inline int16_t
+read_2sbyte_unaligned (const void *p)
+{
+  const union unaligned *up = p;
+  if (MACHINE_ENCODING != __BYTE_ORDER)
+    return (int16_t) bswap_16 (up->u2);
+  return up->s2;
+}
+
+static inline uint32_t
+read_4ubyte_unaligned_noncvt (const void *p)
+{
+  const union unaligned *up = p;
+  return up->u4;
+}
+static inline uint32_t
+read_4ubyte_unaligned (const void *p)
+{
+  const union unaligned *up = p;
+  if (MACHINE_ENCODING != __BYTE_ORDER)
+    return bswap_32 (up->u4);
+  return up->u4;
+}
+static inline int32_t
+read_4sbyte_unaligned (const void *p)
+{
+  const union unaligned *up = p;
+  if (MACHINE_ENCODING != __BYTE_ORDER)
+    return (int32_t) bswap_32 (up->u4);
+  return up->s4;
+}
+
+static inline uint64_t
+read_8ubyte_unaligned (const void *p)
+{
+  const union unaligned *up = p;
+  if (MACHINE_ENCODING != __BYTE_ORDER)
+    return bswap_64 (up->u8);
+  return up->u8;
+}
+static inline int64_t
+read_8sbyte_unaligned (const void *p)
+{
+  const union unaligned *up = p;
+  if (MACHINE_ENCODING != __BYTE_ORDER)
+    return (int64_t) bswap_64 (up->u8);
+  return up->s8;
+}
+
+#endif	/* allow unaligned */
+
+
+#define read_2ubyte_unaligned_inc(Addr) \
+  ({ uint16_t t_ = read_2ubyte_unaligned (Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2);		      \
+     t_; })
+#define read_2sbyte_unaligned_inc(Addr) \
+  ({ int16_t t_ = read_2sbyte_unaligned (Addr);				      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2);		      \
+     t_; })
+
+#define read_4ubyte_unaligned_inc(Addr) \
+  ({ uint32_t t_ = read_4ubyte_unaligned (Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4);		      \
+     t_; })
+#define read_4sbyte_unaligned_inc(Addr) \
+  ({ int32_t t_ = read_4sbyte_unaligned (Addr);				      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4);		      \
+     t_; })
+
+#define read_8ubyte_unaligned_inc(Addr) \
+  ({ uint64_t t_ = read_8ubyte_unaligned (Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8);		      \
+     t_; })
+#define read_8sbyte_unaligned_inc(Addr) \
+  ({ int64_t t_ = read_8sbyte_unaligned (Addr);				      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8);		      \
+     t_; })
+
+#endif	/* memory-access.h */