diff --git a/src/de.hpi.swa.graal.squeak/src/de/hpi/swa/graal/squeak/nodes/plugins/UnixOSProcessPlugin.java b/src/de.hpi.swa.graal.squeak/src/de/hpi/swa/graal/squeak/nodes/plugins/UnixOSProcessPlugin.java
index a40c902f2..0be37af54 100644
--- a/src/de.hpi.swa.graal.squeak/src/de/hpi/swa/graal/squeak/nodes/plugins/UnixOSProcessPlugin.java
+++ b/src/de.hpi.swa.graal.squeak/src/de/hpi/swa/graal/squeak/nodes/plugins/UnixOSProcessPlugin.java
@@ -4,6 +4,7 @@
 import java.util.List;
 
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
+import com.oracle.truffle.api.dsl.Fallback;
 import com.oracle.truffle.api.dsl.GenerateNodeFactory;
 import com.oracle.truffle.api.dsl.NodeFactory;
 import com.oracle.truffle.api.dsl.Specialization;
@@ -13,8 +14,10 @@
 import de.hpi.swa.graal.squeak.model.AbstractSqueakObject;
 import de.hpi.swa.graal.squeak.model.CompiledMethodObject;
 import de.hpi.swa.graal.squeak.model.NativeObject;
+import de.hpi.swa.graal.squeak.model.NilObject;
 import de.hpi.swa.graal.squeak.nodes.primitives.AbstractPrimitiveNode;
 import de.hpi.swa.graal.squeak.nodes.primitives.PrimitiveInterfaces.BinaryPrimitive;
+import de.hpi.swa.graal.squeak.nodes.primitives.PrimitiveInterfaces.BinaryPrimitiveWithoutFallback;
 import de.hpi.swa.graal.squeak.nodes.primitives.PrimitiveInterfaces.TernaryPrimitive;
 import de.hpi.swa.graal.squeak.nodes.primitives.PrimitiveInterfaces.UnaryPrimitive;
 import de.hpi.swa.graal.squeak.nodes.primitives.SqueakPrimitive;
@@ -39,6 +42,25 @@ public List<? extends NodeFactory<? extends AbstractPrimitiveNode>> getFactories
         return factories;
     }
 
+    @GenerateNodeFactory
+    @SqueakPrimitive(names = "primitiveArgumentAt")
+    protected abstract static class PrimArgumentAtNode extends AbstractPrimitiveNode implements BinaryPrimitiveWithoutFallback {
+        protected PrimArgumentAtNode(final CompiledMethodObject method) {
+            super(method);
+        }
+
+        @Specialization(guards = "inBounds1(index, method.image.getImageArguments().length)")
+        protected final Object doAt(@SuppressWarnings("unused") final Object receiver, final long index) {
+            return method.image.wrap(method.image.getImageArguments()[(int) index]);
+        }
+
+        @SuppressWarnings("unused")
+        @Fallback
+        protected final NilObject doNil(final Object receiver, final Object index) {
+            return method.image.nil;
+        }
+    }
+
     @GenerateNodeFactory
     @SqueakPrimitive(names = "primitiveEnvironmentAt")
     protected abstract static class PrimEnvironmentAtNode extends AbstractPrimitiveNode implements BinaryPrimitive {
@@ -104,6 +126,48 @@ protected final Object doAt(@SuppressWarnings("unused") final AbstractSqueakObje
         }
     }
 
+    @GenerateNodeFactory
+    @SqueakPrimitive(names = "primitiveGetStdErrHandle")
+    protected abstract static class PrimGetStdErrHandleNode extends AbstractPrimitiveNode implements UnaryPrimitive {
+
+        protected PrimGetStdErrHandleNode(final CompiledMethodObject method) {
+            super(method);
+        }
+
+        @Specialization
+        protected static final long doGet(@SuppressWarnings("unused") final AbstractSqueakObject receiver) {
+            return FilePlugin.STDIO_HANDLES.ERROR;
+        }
+    }
+
+    @GenerateNodeFactory
+    @SqueakPrimitive(names = "primitiveGetStdInHandle")
+    protected abstract static class PrimGetStdInHandleNode extends AbstractPrimitiveNode implements UnaryPrimitive {
+
+        protected PrimGetStdInHandleNode(final CompiledMethodObject method) {
+            super(method);
+        }
+
+        @Specialization
+        protected static final long doGet(@SuppressWarnings("unused") final AbstractSqueakObject receiver) {
+            return FilePlugin.STDIO_HANDLES.IN;
+        }
+    }
+
+    @GenerateNodeFactory
+    @SqueakPrimitive(names = "primitiveGetStdOutHandle")
+    protected abstract static class PrimGetStdOutHandleNode extends AbstractPrimitiveNode implements UnaryPrimitive {
+
+        protected PrimGetStdOutHandleNode(final CompiledMethodObject method) {
+            super(method);
+        }
+
+        @Specialization
+        protected static final long doGet(@SuppressWarnings("unused") final AbstractSqueakObject receiver) {
+            return FilePlugin.STDIO_HANDLES.OUT;
+        }
+    }
+
     @GenerateNodeFactory
     @SqueakPrimitive(names = "primitiveSigChldNumber")
     protected abstract static class PrimSigChldNumberNode extends AbstractPrimitiveNode implements UnaryPrimitive {