diff --git a/rust-runner/src/alloc.rs b/rust-runner/src/alloc.rs
index 05822c3..63c0eff 100644
--- a/rust-runner/src/alloc.rs
+++ b/rust-runner/src/alloc.rs
@@ -1,4 +1,4 @@
-use parity_wasm::interpreter;
+use parity_wasm::interpreter::{self, ModuleInstance};
 use runtime::Runtime;
 
 pub struct Arena {
@@ -18,7 +18,7 @@ impl Arena {
 }
 
 impl interpreter::UserFunctionInterface for Arena {
-    fn call(&mut self, context: interpreter::CallerContext) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
+    fn call(&mut self, _module: &ModuleInstance, context: interpreter::CallerContext) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
         let amount = context.value_stack.pop_as::<i32>()?;
         self.alloc(amount as u32)
             .map(|val| Some((val as i32).into()))
diff --git a/rust-runner/src/call_args.rs b/rust-runner/src/call_args.rs
index 55805f3..75f244d 100644
--- a/rust-runner/src/call_args.rs
+++ b/rust-runner/src/call_args.rs
@@ -60,6 +60,7 @@ pub fn init(
         write_u32(&mut input_length, input.len() as u32);
         memory.set(input_ptr, input)?;
         println!("input_ptr: {}", input_ptr);
+        println!("input: {:?}", memory.get(input_ptr, input.len()));
     }
 
     memory.set(descriptor_ptr, &context_ptr_slc)?;
diff --git a/rust-runner/src/gas_counter.rs b/rust-runner/src/gas_counter.rs
index 924147a..2dc3e84 100644
--- a/rust-runner/src/gas_counter.rs
+++ b/rust-runner/src/gas_counter.rs
@@ -1,4 +1,4 @@
-use parity_wasm::interpreter;
+use parity_wasm::interpreter::{self, ModuleInstance};
 use runtime::Runtime;
 
 pub struct GasCounter {
@@ -6,7 +6,7 @@ pub struct GasCounter {
 }
 
 impl interpreter::UserFunctionInterface for GasCounter {
-    fn call(&mut self, context: interpreter::CallerContext) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
+    fn call(&mut self, _module: &ModuleInstance, context: interpreter::CallerContext) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
         let prev = self.runtime.env().gas_counter.get();
         let update = context.value_stack.pop_as::<i32>()? as u64;
         if prev + update > self.runtime.env().gas_limit {
diff --git a/rust-runner/src/main.rs b/rust-runner/src/main.rs
index 9f980da..1e00daf 100644
--- a/rust-runner/src/main.rs
+++ b/rust-runner/src/main.rs
@@ -53,7 +53,29 @@ fn main() {
             closure: Box::new(runtime.allocator()),
         }
     );
+    user_functions.insert("_storage_size".to_owned(), 
+        interpreter::UserFunction {
+            params: vec![elements::ValueType::I32],
+            result: Some(elements::ValueType::I32),
+            closure: Box::new(runtime.storage().sizer()),
+        }
+    );
+    user_functions.insert("_storage_read".to_owned(), 
+        interpreter::UserFunction {
+            params: vec![elements::ValueType::I32],
+            result: Some(elements::ValueType::I32),
+            closure: Box::new(runtime.storage().reader()),
+        }
+    );
+    user_functions.insert("_storage_write".to_owned(), 
+        interpreter::UserFunction {
+            params: vec![elements::ValueType::I32],
+            result: Some(elements::ValueType::I32),
+            closure: Box::new(runtime.storage().writer()),
+        }
+    );
     runtime::user_trap(&mut user_functions, "_emscripten_memcpy_big");
+    runtime::user_noop(&mut user_functions, "_free");
 
     let program = parity_wasm::interpreter::ProgramInstance::with_functions(user_functions)
         .expect("Program instance to be created");
diff --git a/rust-runner/src/runtime.rs b/rust-runner/src/runtime.rs
index ff48a04..83ecf35 100644
--- a/rust-runner/src/runtime.rs
+++ b/rust-runner/src/runtime.rs
@@ -1,14 +1,15 @@
 use std::sync::Arc;
-use std::cell::Cell;
+use std::cell::{Cell, RefCell};
 
 use parity_wasm::{interpreter, elements};
-use {alloc, gas_counter};
+use {alloc, gas_counter, storage};
 
 #[derive(Default)]
 pub struct RuntimeEnv {
     pub gas_counter: Cell<u64>,
     pub gas_limit: u64,
     pub dynamic_top: Cell<u32>,
+    pub storage: RefCell<Vec<u8>>,
 }
 
 #[derive(Default, Clone)]
@@ -20,6 +21,7 @@ impl Runtime {
             gas_counter: Cell::new(0),
             gas_limit: gas_limit,
             dynamic_top: Cell::new(stack_space),
+            storage: Default::default(),
         }))
     }
 
@@ -35,6 +37,10 @@ impl Runtime {
         }
     }
 
+    pub fn storage(&self) -> storage::Storage {
+        storage::Storage::new(self.clone())
+    }
+
     pub fn env(&self) -> &RuntimeEnv {
         &*self.0
     }
@@ -44,7 +50,7 @@ pub fn user_trap(funcs: &mut interpreter::UserFunctions, func_name: &str) {
     let func_str = func_name.to_owned();
     funcs.insert(func_str.clone(), 
         interpreter::UserFunction {
-            params: vec![elements::ValueType::I32],
+            params: vec![],
             result: Some(elements::ValueType::I32),
             closure: Box::new(UserTrap(func_str)),
         }
@@ -54,7 +60,32 @@ pub fn user_trap(funcs: &mut interpreter::UserFunctions, func_name: &str) {
 struct UserTrap(String);
 
 impl interpreter::UserFunctionInterface for UserTrap {
-    fn call(&mut self, context: interpreter::CallerContext) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
+    fn call(&mut self, 
+        _module: &interpreter::ModuleInstance, 
+        _context: interpreter::CallerContext
+    ) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
         Err(interpreter::Error::Trap(self.0.clone()))
     }
+}
+
+struct UserNoop;
+
+pub fn user_noop(funcs: &mut interpreter::UserFunctions, func_name: &str) {
+    let func_str = func_name.to_owned();
+    funcs.insert(func_str.clone(), 
+        interpreter::UserFunction {
+            params: vec![],
+            result: None,
+            closure: Box::new(UserNoop),
+        }
+    );
+}
+
+impl interpreter::UserFunctionInterface for UserNoop {
+    fn call(&mut self, 
+        _module: &interpreter::ModuleInstance, 
+        _context: interpreter::CallerContext
+    ) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
+        Ok(None)
+    }
 }
\ No newline at end of file
diff --git a/rust-runner/src/storage.rs b/rust-runner/src/storage.rs
index f35e2bd..4e97a28 100644
--- a/rust-runner/src/storage.rs
+++ b/rust-runner/src/storage.rs
@@ -1,32 +1,41 @@
-use parity_wasm::interpreter::ModuleInstanceInterface;
-use parity_wasm::interpreter::ItemIndex;
+use parity_wasm::interpreter::{self, ItemIndex, ModuleInstanceInterface};
 use std::sync::Arc;
 
 use DEFAULT_MEMORY_INDEX;
+use runtime::Runtime;
 
 pub struct Storage {
-    data: Vec<u8>,
-    module: Arc<ModuleInstanceInterface>,
+    runtime: Runtime,
 }
 
 pub struct Error;
 
 impl Storage {
 
-    pub fn read(&self, offset: u32, len: u32, dst: u32) -> i32 {
-        let memory = match self.module.memory(DEFAULT_MEMORY_INDEX) {
+    pub fn new(runtime: Runtime) -> Self {
+        Storage {
+            runtime: runtime,
+        }
+    }
+
+    pub fn read(&self, module: &interpreter::ModuleInstance, offset: u32, len: u32, dst: u32) -> i32 {
+        let data = self.runtime.env().storage.borrow();
+        
+        let memory = match module.memory(DEFAULT_MEMORY_INDEX) {
             Err(_) => { return -1; },
             Ok(memory) => memory,
         };
 
-        match memory.set(dst, &self.data[offset as usize..offset as usize + len as usize]) {
+        match memory.set(dst, &data[offset as usize..offset as usize + len as usize]) {
             Err(_) => { return -1; }
             Ok(_) => { return len as i32; }
         }
     }
 
-    pub fn write(&mut self, offset: u32, len: u32, src: u32) -> i32 {
-        let memory = match self.module.memory(DEFAULT_MEMORY_INDEX) {
+    pub fn write(&mut self, module: &interpreter::ModuleInstance, offset: u32, len: u32, src: u32) -> i32 {
+        let mut data = self.runtime.env().storage.borrow_mut();
+
+        let memory = match module.memory(DEFAULT_MEMORY_INDEX) {
             Err(_) => { return -1; },
             Ok(memory) => memory,
         };
@@ -36,16 +45,70 @@ impl Storage {
             Ok(slice) => slice,
         };
 
-        if self.data.len() < offset as usize + slice.len() {
-            self.data.reserve(offset as usize + slice.len());
+        if data.len() < offset as usize + slice.len() {
+            data.reserve(offset as usize + slice.len());
             unsafe {
-                self.data.set_len(offset as usize + slice.len());
+                data.set_len(offset as usize + slice.len());
             }
         }
-        self.data[offset as usize..offset as usize + slice.len()].copy_from_slice(&slice[..]);
+        data[offset as usize..offset as usize + slice.len()].copy_from_slice(&slice[..]);
 
         slice.len() as i32
     }
 
-    pub fn size(&self) -> u32 { self.data.len() as u32 }
+    pub fn size(&self, _module: &interpreter::ModuleInstance) -> u32 { self.runtime.env().storage.borrow().len() as u32 }
+
+    pub fn writer(self) -> StorageWrite {
+        StorageWrite(self)
+    }
+
+    pub fn reader(self) -> StorageRead {
+        StorageRead(self)
+    }
+
+    pub fn sizer(self) -> StorageSize {
+        StorageSize(self)
+    }
+}
+
+pub struct StorageWrite(Storage);
+
+impl interpreter::UserFunctionInterface for StorageWrite {
+    fn call(&mut self, 
+        module: &interpreter::ModuleInstance, 
+        context: interpreter::CallerContext,
+    ) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
+        let offset = context.value_stack.pop_as::<i32>()?;
+        let len = context.value_stack.pop_as::<i32>()?;
+        let ptr = context.value_stack.pop_as::<i32>()?;
+
+        Ok(Some(self.0.write(module, offset as u32, len as u32, ptr as u32).into()))
+    }    
+}
+
+pub struct StorageRead(Storage);
+
+impl interpreter::UserFunctionInterface for StorageRead {
+    fn call(&mut self, 
+        module: &interpreter::ModuleInstance, 
+        context: interpreter::CallerContext,
+    ) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> {
+        let offset = context.value_stack.pop_as::<i32>()?;
+        let len = context.value_stack.pop_as::<i32>()?;
+        let ptr = context.value_stack.pop_as::<i32>()?;
+
+        Ok(Some(self.0.read(module, offset as u32, len as u32, ptr as u32).into()))
+    }    
+}
+
+pub struct StorageSize(Storage);
+
+impl interpreter::UserFunctionInterface for StorageSize {
+    fn call(&mut self, 
+        module: &interpreter::ModuleInstance, 
+        context: interpreter::CallerContext,
+    ) -> Result<Option<interpreter::RuntimeValue>, interpreter::Error> 
+    {        
+        Ok(Some((self.0.size(module) as i32).into()))
+    }    
 }
\ No newline at end of file