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diff --git a/base/object_file.hh b/base/object_file.hh
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+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __OBJECT_FILE_HH__
+#define __OBJECT_FILE_HH__
+
+#include "ecoff.hh"
+#include "isa_traits.hh"	// for Addr
+
+class SymbolTable;
+
+class ObjectFile
+{
+  protected:
+    std::string name;
+    int descriptor;
+    uint8_t *data;
+    size_t len;
+
+  public:
+    ObjectFile();
+    explicit ObjectFile(std::string file);
+    virtual ~ObjectFile();
+
+    bool open(std::string file);
+    void close();
+
+    virtual bool loadGlobals(SymbolTable *symtab) = 0;
+    virtual bool loadLocals(SymbolTable *symtab) = 0;
+    virtual void postOpen() = 0;
+
+  protected:
+    Addr text_off;
+    Addr data_off;
+    Addr bss_off;
+
+    size_t text_size;
+    size_t data_size;
+    size_t bss_size;
+
+  public:
+    Addr textOffset() const { return text_off; }
+    Addr dataOffset() const { return data_off; }
+    Addr bssOffset() const { return bss_off; }
+
+    size_t textSize() const { return text_size; }
+    size_t dataSize() const { return data_size; }
+    size_t bssSize() const { return bss_size; }
+};
+
+class EcoffObject : public ObjectFile
+{
+  protected:
+    EcoffFileHeader *exec;
+    EcoffAOutHeader *aout;
+
+  public:
+    EcoffObject() {}
+    explicit EcoffObject(std::string file) { open(file); }
+    virtual ~EcoffObject() {}
+
+    virtual bool loadGlobals(SymbolTable *symtab);
+    virtual bool loadLocals(SymbolTable *symtab);
+    virtual void postOpen();
+};
+
+#endif // __OBJECT_FILE_HH__