diff --git a/libdw/memory-access.h b/libdw/memory-access.h
new file mode 100644
index 0000000..ed68bdb
--- /dev/null
+++ b/libdw/memory-access.h
@@ -0,0 +1,305 @@
+/* Unaligned memory access functionality.
+   Copyright (C) 2000-2014 Red Hat, Inc.
+   This file is part of elfutils.
+   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 <limits.h>
+#include <stdint.h>
+
+
+/* Number decoding macros.  See 7.6 Variable Length Data.  */
+
+#define len_leb128(var) ((8 * sizeof (var) + 6) / 7)
+
+static inline size_t
+__libdw_max_len_leb128 (const size_t type_len,
+			const unsigned char *addr, const unsigned char *end)
+{
+  const size_t pointer_len = likely (addr < end) ? end - addr : 0;
+  return likely (type_len <= pointer_len) ? type_len : pointer_len;
+}
+
+static inline size_t
+__libdw_max_len_uleb128 (const unsigned char *addr, const unsigned char *end)
+{
+  const size_t type_len = len_leb128 (uint64_t);
+  return __libdw_max_len_leb128 (type_len, addr, end);
+}
+
+static inline size_t
+__libdw_max_len_sleb128 (const unsigned char *addr, const unsigned char *end)
+{
+  /* Subtract one step, so we don't shift into sign bit.  */
+  const size_t type_len = len_leb128 (int64_t) - 1;
+  return __libdw_max_len_leb128 (type_len, addr, end);
+}
+
+#define get_uleb128_step(var, addr, nth)				      \
+  do {									      \
+    unsigned char __b = *(addr)++;					      \
+    (var) |= (typeof (var)) (__b & 0x7f) << ((nth) * 7);		      \
+    if (likely ((__b & 0x80) == 0))					      \
+      return (var);							      \
+  } while (0)
+
+static inline uint64_t
+__libdw_get_uleb128 (const unsigned char **addrp, const unsigned char *end)
+{
+  uint64_t acc = 0;
+
+  /* Unroll the first step to help the compiler optimize
+     for the common single-byte case.  */
+  get_uleb128_step (acc, *addrp, 0);
+
+  const size_t max = __libdw_max_len_uleb128 (*addrp - 1, end);
+  for (size_t i = 1; i < max; ++i)
+    get_uleb128_step (acc, *addrp, i);
+  /* Other implementations set VALUE to UINT_MAX in this
+     case.  So we better do this as well.  */
+  return UINT64_MAX;
+}
+
+static inline uint64_t
+__libdw_get_uleb128_unchecked (const unsigned char **addrp)
+{
+  uint64_t acc = 0;
+
+  /* Unroll the first step to help the compiler optimize
+     for the common single-byte case.  */
+  get_uleb128_step (acc, *addrp, 0);
+
+  const size_t max = len_leb128 (uint64_t);
+  for (size_t i = 1; i < max; ++i)
+    get_uleb128_step (acc, *addrp, i);
+  /* Other implementations set VALUE to UINT_MAX in this
+     case.  So we better do this as well.  */
+  return UINT64_MAX;
+}
+
+/* Note, addr needs to me smaller than end. */
+#define get_uleb128(var, addr, end) ((var) = __libdw_get_uleb128 (&(addr), end))
+#define get_uleb128_unchecked(var, addr) ((var) = __libdw_get_uleb128_unchecked (&(addr)))
+
+/* The signed case is similar, but we sign-extend the result.  */
+
+#define get_sleb128_step(var, addr, nth)				      \
+  do {									      \
+    unsigned char __b = *(addr)++;					      \
+    if (likely ((__b & 0x80) == 0))					      \
+      {									      \
+	struct { signed int i:7; } __s = { .i = __b };			      \
+	(var) |= (typeof (var)) __s.i * ((typeof (var)) 1 << ((nth) * 7));    \
+	return (var);							      \
+      }									      \
+    (var) |= (typeof (var)) (__b & 0x7f) << ((nth) * 7);		      \
+  } while (0)
+
+static inline int64_t
+__libdw_get_sleb128 (const unsigned char **addrp, const unsigned char *end)
+{
+  int64_t acc = 0;
+
+  /* Unroll the first step to help the compiler optimize
+     for the common single-byte case.  */
+  get_sleb128_step (acc, *addrp, 0);
+
+  const size_t max = __libdw_max_len_sleb128 (*addrp - 1, end);
+  for (size_t i = 1; i < max; ++i)
+    get_sleb128_step (acc, *addrp, i);
+  /* Other implementations set VALUE to INT_MAX in this
+     case.  So we better do this as well.  */
+  return INT64_MAX;
+}
+
+#define get_sleb128(var, addr, end) ((var) = __libdw_get_sleb128 (&(addr), end))
+
+
+/* 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(Dbg, Addr) \
+  (unlikely ((Dbg)->other_byte_order)					      \
+   ? bswap_16 (*((const uint16_t *) (Addr)))				      \
+   : *((const uint16_t *) (Addr)))
+# define read_2sbyte_unaligned(Dbg, Addr) \
+  (unlikely ((Dbg)->other_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(Dbg, Addr) \
+  (unlikely ((Dbg)->other_byte_order)					      \
+   ? bswap_32 (*((const uint32_t *) (Addr)))				      \
+   : *((const uint32_t *) (Addr)))
+# define read_4sbyte_unaligned(Dbg, Addr) \
+  (unlikely ((Dbg)->other_byte_order)					      \
+   ? (int32_t) bswap_32 (*((const int32_t *) (Addr)))			      \
+   : *((const int32_t *) (Addr)))
+
+# define read_8ubyte_unaligned_noncvt(Addr) \
+   *((const uint64_t *) (Addr))
+# define read_8ubyte_unaligned(Dbg, Addr) \
+  (unlikely ((Dbg)->other_byte_order)					      \
+   ? bswap_64 (*((const uint64_t *) (Addr)))				      \
+   : *((const uint64_t *) (Addr)))
+# define read_8sbyte_unaligned(Dbg, Addr) \
+  (unlikely ((Dbg)->other_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;
+
+# define read_2ubyte_unaligned(Dbg, Addr) \
+  read_2ubyte_unaligned_1 ((Dbg)->other_byte_order, (Addr))
+# define read_2sbyte_unaligned(Dbg, Addr) \
+  read_2sbyte_unaligned_1 ((Dbg)->other_byte_order, (Addr))
+# define read_4ubyte_unaligned(Dbg, Addr) \
+  read_4ubyte_unaligned_1 ((Dbg)->other_byte_order, (Addr))
+# define read_4sbyte_unaligned(Dbg, Addr) \
+  read_4sbyte_unaligned_1 ((Dbg)->other_byte_order, (Addr))
+# define read_8ubyte_unaligned(Dbg, Addr) \
+  read_8ubyte_unaligned_1 ((Dbg)->other_byte_order, (Addr))
+# define read_8sbyte_unaligned(Dbg, Addr) \
+  read_8sbyte_unaligned_1 ((Dbg)->other_byte_order, (Addr))
+
+static inline uint16_t
+read_2ubyte_unaligned_1 (bool other_byte_order, const void *p)
+{
+  const union unaligned *up = p;
+  if (unlikely (other_byte_order))
+    return bswap_16 (up->u2);
+  return up->u2;
+}
+static inline int16_t
+read_2sbyte_unaligned_1 (bool other_byte_order, const void *p)
+{
+  const union unaligned *up = p;
+  if (unlikely (other_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_1 (bool other_byte_order, const void *p)
+{
+  const union unaligned *up = p;
+  if (unlikely (other_byte_order))
+    return bswap_32 (up->u4);
+  return up->u4;
+}
+static inline int32_t
+read_4sbyte_unaligned_1 (bool other_byte_order, const void *p)
+{
+  const union unaligned *up = p;
+  if (unlikely (other_byte_order))
+    return (int32_t) bswap_32 (up->u4);
+  return up->s4;
+}
+
+static inline uint64_t
+read_8ubyte_unaligned_noncvt (const void *p)
+{
+  const union unaligned *up = p;
+  return up->u8;
+}
+static inline uint64_t
+read_8ubyte_unaligned_1 (bool other_byte_order, const void *p)
+{
+  const union unaligned *up = p;
+  if (unlikely (other_byte_order))
+    return bswap_64 (up->u8);
+  return up->u8;
+}
+static inline int64_t
+read_8sbyte_unaligned_1 (bool other_byte_order, const void *p)
+{
+  const union unaligned *up = p;
+  if (unlikely (other_byte_order))
+    return (int64_t) bswap_64 (up->u8);
+  return up->s8;
+}
+
+#endif	/* allow unaligned */
+
+
+#define read_2ubyte_unaligned_inc(Dbg, Addr) \
+  ({ uint16_t t_ = read_2ubyte_unaligned (Dbg, Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2);		      \
+     t_; })
+#define read_2sbyte_unaligned_inc(Dbg, Addr) \
+  ({ int16_t t_ = read_2sbyte_unaligned (Dbg, Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 2);		      \
+     t_; })
+
+#define read_4ubyte_unaligned_inc(Dbg, Addr) \
+  ({ uint32_t t_ = read_4ubyte_unaligned (Dbg, Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4);		      \
+     t_; })
+#define read_4sbyte_unaligned_inc(Dbg, Addr) \
+  ({ int32_t t_ = read_4sbyte_unaligned (Dbg, Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 4);		      \
+     t_; })
+
+#define read_8ubyte_unaligned_inc(Dbg, Addr) \
+  ({ uint64_t t_ = read_8ubyte_unaligned (Dbg, Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8);		      \
+     t_; })
+#define read_8sbyte_unaligned_inc(Dbg, Addr) \
+  ({ int64_t t_ = read_8sbyte_unaligned (Dbg, Addr);			      \
+     Addr = (__typeof (Addr)) (((uintptr_t) (Addr)) + 8);		      \
+     t_; })
+
+
+#define read_addr_unaligned_inc(Nbytes, Dbg, Addr)			\
+  (assert ((Nbytes) == 4 || (Nbytes) == 8),				\
+    ((Nbytes) == 4 ? read_4ubyte_unaligned_inc (Dbg, Addr)		\
+     : read_8ubyte_unaligned_inc (Dbg, Addr)))
+
+#endif	/* memory-access.h */