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diff --git a/js/src/jit/arm/disasm/Disasm-arm.h b/js/src/jit/arm/disasm/Disasm-arm.h
new file mode 100644
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+++ b/js/src/jit/arm/disasm/Disasm-arm.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ */
+// Copyright 2007-2008 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef jit_arm_disasm_Disasm_arm_h
+#define jit_arm_disasm_Disasm_arm_h
+
+#ifdef JS_DISASM_ARM
+
+#  include "mozilla/Assertions.h"
+#  include "mozilla/Types.h"
+
+#  include <stdio.h>
+
+namespace js {
+namespace jit {
+namespace disasm {
+
+typedef unsigned char byte;
+
+// A reasonable (ie, safe) buffer size for the disassembly of a single
+// instruction.
+const int ReasonableBufferSize = 256;
+
+// Vector as used by the original code to allow for minimal modification.
+// Functions exactly like a character array with helper methods.
+template <typename T>
+class V8Vector {
+ public:
+  V8Vector() : start_(nullptr), length_(0) {}
+  V8Vector(T* data, int length) : start_(data), length_(length) {
+    MOZ_ASSERT(length == 0 || (length > 0 && data != nullptr));
+  }
+
+  // Returns the length of the vector.
+  int length() const { return length_; }
+
+  // Returns the pointer to the start of the data in the vector.
+  T* start() const { return start_; }
+
+  // Access individual vector elements - checks bounds in debug mode.
+  T& operator[](int index) const {
+    MOZ_ASSERT(0 <= index && index < length_);
+    return start_[index];
+  }
+
+  inline V8Vector<T> operator+(int offset) {
+    MOZ_ASSERT(offset < length_);
+    return V8Vector<T>(start_ + offset, length_ - offset);
+  }
+
+ private:
+  T* start_;
+  int length_;
+};
+
+template <typename T, int kSize>
+class EmbeddedVector : public V8Vector<T> {
+ public:
+  EmbeddedVector() : V8Vector<T>(buffer_, kSize) {}
+
+  explicit EmbeddedVector(T initial_value) : V8Vector<T>(buffer_, kSize) {
+    for (int i = 0; i < kSize; ++i) {
+      buffer_[i] = initial_value;
+    }
+  }
+
+  // When copying, make underlying Vector to reference our buffer.
+  EmbeddedVector(const EmbeddedVector& rhs) : V8Vector<T>(rhs) {
+    MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+    this->set_start(buffer_);
+  }
+
+  EmbeddedVector& operator=(const EmbeddedVector& rhs) {
+    if (this == &rhs) return *this;
+    V8Vector<T>::operator=(rhs);
+    MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+    this->set_start(buffer_);
+    return *this;
+  }
+
+ private:
+  T buffer_[kSize];
+};
+
+// Interface and default implementation for converting addresses and
+// register-numbers to text.  The default implementation is machine
+// specific.
+class NameConverter {
+ public:
+  virtual ~NameConverter() {}
+  virtual const char* NameOfCPURegister(int reg) const;
+  virtual const char* NameOfByteCPURegister(int reg) const;
+  virtual const char* NameOfXMMRegister(int reg) const;
+  virtual const char* NameOfAddress(byte* addr) const;
+  virtual const char* NameOfConstant(byte* addr) const;
+  virtual const char* NameInCode(byte* addr) const;
+
+ protected:
+  EmbeddedVector<char, 128> tmp_buffer_;
+};
+
+// A generic Disassembler interface
+class Disassembler {
+ public:
+  // Caller deallocates converter.
+  explicit Disassembler(const NameConverter& converter);
+
+  virtual ~Disassembler();
+
+  // Writes one disassembled instruction into 'buffer' (0-terminated).
+  // Returns the length of the disassembled machine instruction in bytes.
+  int InstructionDecode(V8Vector<char> buffer, uint8_t* instruction);
+
+  // Returns -1 if instruction does not mark the beginning of a constant pool,
+  // or the number of entries in the constant pool beginning here.
+  int ConstantPoolSizeAt(byte* instruction);
+
+  // Write disassembly into specified file 'f' using specified NameConverter
+  // (see constructor).
+  static void Disassemble(FILE* f, uint8_t* begin, uint8_t* end);
+
+ private:
+  const NameConverter& converter_;
+
+  // Disallow implicit constructors.
+  Disassembler() = delete;
+  Disassembler(const Disassembler&) = delete;
+  void operator=(const Disassembler&) = delete;
+};
+
+}  // namespace disasm
+}  // namespace jit
+}  // namespace js
+
+#endif  // JS_DISASM_ARM
+
+#endif  // jit_arm_disasm_Disasm_arm_h