diff --git a/core/org.eclipse.cdt.core/src/org/eclipse/cdt/core/IAddress.java b/core/org.eclipse.cdt.core/src/org/eclipse/cdt/core/IAddress.java
index 3312d7196f6..cc74b907255 100644
--- a/core/org.eclipse.cdt.core/src/org/eclipse/cdt/core/IAddress.java
+++ b/core/org.eclipse.cdt.core/src/org/eclipse/cdt/core/IAddress.java
@@ -7,6 +7,7 @@
  * 
  * Contributors:
  *     Intel Corporation - Initial API and implementation
+ *     Mark Mitchell, CodeSourcery - Bug 136896: View variables in binary format
  *******************************************************************************/
 package org.eclipse.cdt.core;
 
@@ -20,8 +21,7 @@ import java.math.BigInteger;
  * Please see Addr32 and Addr64 classes to see how this interface should 
  * be extended
  */
-public interface IAddress extends Comparable
-{
+public interface IAddress extends Comparable {
 	/**
 	 * Adds offset to address and returns new address object 
 	 * which is the result  
@@ -103,6 +103,16 @@ public interface IAddress extends Comparable
 	 */
 	String toHexAddressString();
 
+
+	/**
+	 * Converts address to the binary representation with '0b' prefix and 
+	 * with all leading zeros. The length of returned string should be 
+	 * the same for all addresses of given class. I.e. 34 for 32-bit 
+	 * addresses and 66 for 64-bit addresses
+	 * @return
+	 */
+	String toBinaryAddressString();
+
 	/**
 	 * Returns amount of symbols in hex representation. Is identical to 
 	 * toHexAddressString().length(). It is present for perfomance purpose.
diff --git a/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr32.java b/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr32.java
index 701b6e895b5..9a96ed920db 100644
--- a/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr32.java
+++ b/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr32.java
@@ -7,7 +7,8 @@
  * 
  * Contributors:
  *     Intel Corporation - Initial API and implementation
- ******************************************************************************/
+ *     Mark Mitchell, CodeSourcery - Bug 136896: View variables in binary format
+******************************************************************************/
 package org.eclipse.cdt.utils;
 
 import java.math.BigInteger;
@@ -26,6 +27,8 @@ public class Addr32 implements IAddress {
 	private static final int BYTES_NUM = 4;
 	private static final int DIGITS_NUM = BYTES_NUM * 2;
 	private static final int CHARS_NUM = DIGITS_NUM + 2;
+	private static final int BINARY_DIGITS_NUM = BYTES_NUM * 8;
+	private static final int BINARY_CHARS_NUM = BINARY_DIGITS_NUM + 2;
 
 	private final long address;
 
@@ -131,6 +134,18 @@ public class Addr32 implements IAddress {
 		return sb.toString();
 	}
 
+	public String toBinaryAddressString() {
+		String addressString = Long.toString(address, 2);
+		StringBuffer sb = new StringBuffer(BINARY_CHARS_NUM);
+		int count = BINARY_DIGITS_NUM - addressString.length();
+		sb.append("0b"); //$NON-NLS-1$
+		for (int i = 0; i < count; ++i) {
+			sb.append('0');
+		}
+		sb.append(addressString);
+		return sb.toString();
+	}
+
 	public int getCharsNum() {
 		return CHARS_NUM;
 	}
diff --git a/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr64.java b/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr64.java
index ade86440d58..47b20ca9b61 100644
--- a/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr64.java
+++ b/core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/Addr64.java
@@ -7,6 +7,7 @@
  * 
  * Contributors:
  *     Intel Corporation - Initial API and implementation
+ *     Mark Mitchell, CodeSourcery - Bug 136896: View variables in binary format
  ******************************************************************************/
 package org.eclipse.cdt.utils;
 
@@ -24,6 +25,8 @@ public class Addr64 implements IAddress {
 	private static final int BYTES_NUM = 8;
 	private static final int DIGITS_NUM = BYTES_NUM * 2;
 	private static final int CHARS_NUM = DIGITS_NUM + 2;
+	private static final int BINARY_DIGITS_NUM = BYTES_NUM * 8;
+	private static final int BINARY_CHARS_NUM = BINARY_DIGITS_NUM + 2;
 
 	private final BigInteger address;
 
@@ -126,6 +129,18 @@ public class Addr64 implements IAddress {
 		return sb.toString();
 	}
 
+	public String toBinaryAddressString() {
+		String addressString = address.toString(2);
+		StringBuffer sb = new StringBuffer(BINARY_CHARS_NUM);
+		int count = BINARY_DIGITS_NUM - addressString.length();
+		sb.append("0b"); //$NON-NLS-1$
+		for (int i = 0; i < count; ++i) {
+			sb.append('0');
+		}
+		sb.append(addressString);
+		return sb.toString();
+	}
+
 	public int getCharsNum() {
 		return CHARS_NUM;
 	}
diff --git a/debug/org.eclipse.cdt.debug.core/ChangeLog b/debug/org.eclipse.cdt.debug.core/ChangeLog
index 2fc6ffe42b6..71b112460a8 100644
--- a/debug/org.eclipse.cdt.debug.core/ChangeLog
+++ b/debug/org.eclipse.cdt.debug.core/ChangeLog
@@ -1,3 +1,8 @@
+2006-08-14 Mikhail Khodjaiants
+	Bug 136896: View variables in binary format.
+	Applied modified patch from Mark Mitchell (CodeSourcery).
+	* CValue.java
+
 2006-05-31 Mikhail Khodjaiants
 	Bug 144719: [Modules view] Modules from from different sessions are mixed up.
 	* CDebugElement.java
diff --git a/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CValue.java b/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CValue.java
index 204c7a730f5..a7b6495c5f0 100644
--- a/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CValue.java
+++ b/debug/org.eclipse.cdt.debug.core/src/org/eclipse/cdt/debug/internal/core/model/CValue.java
@@ -7,6 +7,7 @@
  *
  * Contributors:
  *     QNX Software Systems - Initial API and implementation
+ *     Mark Mitchell, CodeSourcery - Bug 136896: View variables in binary format
  *******************************************************************************/
 package org.eclipse.cdt.debug.internal.core.model;
 
@@ -246,6 +247,12 @@ public class CValue extends AbstractCValue {
 			sb.append( (stringValue.length() > 2) ? stringValue.substring( stringValue.length() - 2 ) : stringValue );
 			return sb.toString();
 		}
+		else if ( CVariableFormat.BINARY.equals( format ) ) {
+			StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+			String stringValue = (isUnsigned()) ? Integer.toBinaryString( value.shortValue() ) : Integer.toBinaryString( (byte)value.byteValue() );
+			sb.append( (stringValue.length() > 8) ? stringValue.substring( stringValue.length() - 8 ) : stringValue );
+			return sb.toString();
+		}
 		return null;
 	}
 
@@ -260,6 +267,12 @@ public class CValue extends AbstractCValue {
 			sb.append( (stringValue.length() > 4) ? stringValue.substring( stringValue.length() - 4 ) : stringValue );
 			return sb.toString();
 		}
+		else if ( CVariableFormat.BINARY.equals( format ) ) {
+			StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+			String stringValue = Integer.toBinaryString( (isUnsigned()) ? value.intValue() : value.shortValue() );
+			sb.append( (stringValue.length() > 16) ? stringValue.substring( stringValue.length() - 16 ) : stringValue );
+			return sb.toString();
+		}
 		return null;
 	}
 
@@ -274,6 +287,12 @@ public class CValue extends AbstractCValue {
 			sb.append( (stringValue.length() > 8) ? stringValue.substring( stringValue.length() - 8 ) : stringValue );
 			return sb.toString();
 		}
+		else if ( CVariableFormat.BINARY.equals( format ) ) {
+			StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+			String stringValue = (isUnsigned()) ? Long.toBinaryString( value.longValue() ) : Integer.toBinaryString( value.intValue() );
+			sb.append( (stringValue.length() > 32) ? stringValue.substring( stringValue.length() - 32 ) : stringValue );
+			return sb.toString();
+		}
 		return null;
 	}
 
@@ -297,6 +316,16 @@ public class CValue extends AbstractCValue {
 					sb.append( Long.toHexString( value.longValue() ) );
 				return sb.toString();
 			}
+			else if ( CVariableFormat.BINARY.equals( format ) ) {
+				StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+				if ( isUnsigned() ) {
+					BigInteger bigValue = new BigInteger( value.getValueString() );
+					sb.append( bigValue.toString( 2 ) );
+				}
+				else
+					sb.append( Long.toBinaryString( value.longValue() ) );
+				return sb.toString();
+			}
 		}
 		catch( NumberFormatException e ) {
 		}
@@ -323,6 +352,16 @@ public class CValue extends AbstractCValue {
 					sb.append( Long.toHexString( value.longValue() ) );
 				return sb.toString();
 			}
+			else if ( CVariableFormat.BINARY.equals( format ) ) {
+				StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+				if ( isUnsigned() ) {
+					BigInteger bigValue = new BigInteger( value.getValueString() );
+					sb.append( bigValue.toString( 2 ) );
+				}
+				else
+					sb.append( Long.toBinaryString( value.longValue() ) );
+				return sb.toString();
+			}
 		}
 		catch( NumberFormatException e ) {
 		}
@@ -348,6 +387,12 @@ public class CValue extends AbstractCValue {
 			sb.append( (stringValue.length() > 8) ? stringValue.substring( stringValue.length() - 8 ) : stringValue );
 			return sb.toString();
 		}
+		else if ( CVariableFormat.BINARY.equals( format ) ) {
+			StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+			String stringValue = Long.toBinaryString( longValue );
+			sb.append( (stringValue.length() > 32) ? stringValue.substring( stringValue.length() - 32 ) : stringValue );
+			return sb.toString();
+		}
 		return null;
 	}
 
@@ -370,6 +415,12 @@ public class CValue extends AbstractCValue {
 			sb.append( (stringValue.length() > 16) ? stringValue.substring( stringValue.length() - 16 ) : stringValue );
 			return sb.toString();
 		}
+		else if ( CVariableFormat.BINARY.equals( format ) ) {
+			StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+			String stringValue = Long.toHexString( longValue );
+			sb.append( (stringValue.length() > 64) ? stringValue.substring( stringValue.length() - 64 ) : stringValue );
+			return sb.toString();
+		}
 		return null;
 	}
 
@@ -387,6 +438,8 @@ public class CValue extends AbstractCValue {
 			return address.toHexAddressString();
 		if ( CVariableFormat.DECIMAL.equals( format ) )
 			return address.toString();
+		if ( CVariableFormat.BINARY.equals( format ) )
+			return address.toBinaryAddressString();
 		return null;
 	}
 
@@ -404,6 +457,12 @@ public class CValue extends AbstractCValue {
 					sb.append( (stringValue.length() > 4) ? stringValue.substring( stringValue.length() - 4 ) : stringValue );
 					return sb.toString();
 				}
+				else if ( CVariableFormat.BINARY.equals( format ) ) {
+					StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+					String stringValue = Integer.toBinaryString( (isUnsigned()) ? value.intValue() : value.shortValue() );
+					sb.append( (stringValue.length() > 16) ? stringValue.substring( stringValue.length() - 16 ) : stringValue );
+					return sb.toString();
+				}
 			}
 			if ( size == 4 ) {
 				CVariableFormat format = getParentVariable().getFormat(); 
@@ -416,6 +475,12 @@ public class CValue extends AbstractCValue {
 					sb.append( (stringValue.length() > 8) ? stringValue.substring( stringValue.length() - 8 ) : stringValue );
 					return sb.toString();
 				}
+				else if ( CVariableFormat.BINARY.equals( format ) ) {
+					StringBuffer sb = new StringBuffer( "0b" ); //$NON-NLS-1$
+					String stringValue = (isUnsigned()) ? Long.toBinaryString( value.longValue() ) : Integer.toHexString( value.intValue() );
+					sb.append( (stringValue.length() > 32) ? stringValue.substring( stringValue.length() - 32 ) : stringValue );
+					return sb.toString();
+				}
 			}
 		}
 		return value.getValueString();
diff --git a/debug/org.eclipse.cdt.debug.ui/ChangeLog b/debug/org.eclipse.cdt.debug.ui/ChangeLog
index 4918ec67f80..24a6f2884a9 100644
--- a/debug/org.eclipse.cdt.debug.ui/ChangeLog
+++ b/debug/org.eclipse.cdt.debug.ui/ChangeLog
@@ -1,3 +1,12 @@
+2006-08-14 Mikhail Khodjaiants
+	Bug 136896: View variables in binary format.
+	Applied modified patch from Mark Mitchell (CodeSourcery).
+	* plugin.properties
+	* plugin.xml
+	* PreferenceMessages.properties
+	* CDebugPreferencePage.java
+	* BinaryVariableFormatActionDelegate.java
+
 2006-05-31 Mikhail Khodjaiants
 	Bug 144719: [Modules view] Modules from from different sessions are mixed up.
 	* ModulesViewEventHandler.java
diff --git a/debug/org.eclipse.cdt.debug.ui/plugin.properties b/debug/org.eclipse.cdt.debug.ui/plugin.properties
index 6cdd042abee..50cef95140e 100644
--- a/debug/org.eclipse.cdt.debug.ui/plugin.properties
+++ b/debug/org.eclipse.cdt.debug.ui/plugin.properties
@@ -62,6 +62,7 @@ CVariableFormatMenu.label=Format
 HexVariableFormatAction.label=Hexadecimal
 DecVariableFormatAction.label=Decimal
 NaturalVariableFormatAction.label=Natural
+BinaryVariableFormatAction.label=Binary
 
 CDebugActionGroup.name=C/C++ Debug
 
diff --git a/debug/org.eclipse.cdt.debug.ui/plugin.xml b/debug/org.eclipse.cdt.debug.ui/plugin.xml
index e354d321cd9..8cf97350a4c 100644
--- a/debug/org.eclipse.cdt.debug.ui/plugin.xml
+++ b/debug/org.eclipse.cdt.debug.ui/plugin.xml
@@ -397,6 +397,13 @@
                enablesFor="1"
                id="org.eclipse.cdt.debug.internal.ui.actions.NaturalVariableFormatActionDelegate">
          </action>
+         <action
+               class="org.eclipse.cdt.debug.internal.ui.actions.BinaryVariableFormatActionDelegate"
+               enablesFor="1"
+               helpContextId="binary_variable_format_action_context"
+               id="org.eclipse.cdt.debug.internal.ui.actions.BinaryVariableFormatActionDelegate"
+               label="%BinaryVariableFormatAction.label"
+               menubarPath="org.eclipse.cdt.debug.ui.CVariableFormatMenu/formatGroup"/>
       </objectContribution>
       <objectContribution
             objectClass="org.eclipse.cdt.debug.core.model.ICSignal"
diff --git a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/actions/BinaryVariableFormatActionDelegate.java b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/actions/BinaryVariableFormatActionDelegate.java
new file mode 100644
index 00000000000..8a04f3df6c5
--- /dev/null
+++ b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/actions/BinaryVariableFormatActionDelegate.java
@@ -0,0 +1,26 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2004 QNX Software Systems and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Mark Mitchell, CodeSourcery - Bug 136896: View variables in binary format
+ *******************************************************************************/
+package org.eclipse.cdt.debug.internal.ui.actions;
+
+import org.eclipse.cdt.debug.core.model.CVariableFormat;
+
+/**
+ * The delegate of the "Binary Format" action.
+ */
+public class BinaryVariableFormatActionDelegate extends VariableFormatActionDelegate {
+
+	/**
+	 * Constructor for BinaryVariableFormatActionDelegate.
+	 */
+	public BinaryVariableFormatActionDelegate() {
+		super( CVariableFormat.BINARY );
+	}
+}
diff --git a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/CDebugPreferencePage.java b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/CDebugPreferencePage.java
index 177eb8dc581..15ad5eaba25 100644
--- a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/CDebugPreferencePage.java
+++ b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/CDebugPreferencePage.java
@@ -71,9 +71,9 @@ public class CDebugPreferencePage extends PreferencePage implements IWorkbenchPr
 	private static final int NUMBER_OF_DIGITS = 3;
 
 	// Format constants
-	private static int[] fFormatIds = new int[]{ ICDIFormat.NATURAL, ICDIFormat.HEXADECIMAL, ICDIFormat.DECIMAL };
+	private static int[] fFormatIds = new int[]{ ICDIFormat.NATURAL, ICDIFormat.HEXADECIMAL, ICDIFormat.DECIMAL, ICDIFormat.BINARY };
 
-	private static String[] fFormatLabels = new String[]{ PreferenceMessages.getString( "CDebugPreferencePage.0" ), PreferenceMessages.getString( "CDebugPreferencePage.1" ), PreferenceMessages.getString( "CDebugPreferencePage.2" ) }; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+	private static String[] fFormatLabels = new String[]{ PreferenceMessages.getString( "CDebugPreferencePage.0" ), PreferenceMessages.getString( "CDebugPreferencePage.1" ), PreferenceMessages.getString( "CDebugPreferencePage.2" ), PreferenceMessages.getString( "CDebugPreferencePage.14" ) }; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
 
 	private PropertyChangeListener fPropertyChangeListener;
 
diff --git a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/PreferenceMessages.properties b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/PreferenceMessages.properties
index 3c9f7d90568..a33cbc2c066 100644
--- a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/PreferenceMessages.properties
+++ b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/preferences/PreferenceMessages.properties
@@ -22,6 +22,7 @@ CDebugPreferencePage.10=Default register format:
 CDebugPreferencePage.11=Disassembly options
 CDebugPreferencePage.12=Maximum number of displayed instructions: 
 CDebugPreferencePage.13=The valid value range is [{0},{1}].
+CDebugPreferencePage.14=Binary
 SourcePreferencePage.0=Common source lookup path settings.
 SourcePreferencePage.0=Common S&ource Lookup Path:
 DebuggerTypesPage.0=Select All