diff --git a/lib/ast/call_site_expression.rb b/lib/ast/call_site_expression.rb
index 5edd6adc..8e6d7020 100644
--- a/lib/ast/call_site_expression.rb
+++ b/lib/ast/call_site_expression.rb
@@ -11,10 +11,24 @@ module Ast
       function = context.program.get_or_create_function(name)
       raise "Forward declaration not implemented (#{name}) #{inspect}" if function == nil
       call = Vm::CallSite.new( name ,  params  , function)
+      save_locals context , into
       call.load_args into
       call.do_call into
+      resore_locals context , into
     end
-    
+
+    def save_locals context , into
+      into.instance_eval do 
+        push [:r0, :r1 , :r2]
+      end
+    end
+
+    def resore_locals context , into
+      into.instance_eval do 
+        pop [:r0, :r1 , :r2]
+      end
+    end
+
     def inspect
       self.class.name + ".new(" + name.inspect + ", ["+ 
         args.collect{|m| m.inspect }.join( ",") +"] )"  
diff --git a/lib/ast/operator_expressions.rb b/lib/ast/operator_expressions.rb
index d07ed818..ec185e25 100644
--- a/lib/ast/operator_expressions.rb
+++ b/lib/ast/operator_expressions.rb
@@ -18,6 +18,7 @@ module Ast
     def compile context , into
       puts "compile operator #{to_s}"
       r_val = right.compile(context , into)
+      puts "compiled right #{r_val.inspect}"
       if operator == "="    # assignment, value based
         raise "Can only assign variables, not #{left}" unless left.is_a?(NameExpression) 
         l_val = context.locals[left.name]
@@ -38,7 +39,9 @@ module Ast
         code = l_val.less_or_equal into , r_val
       when "+"
         res = Vm::Integer.new(context.function.next_register)
-        code = res.plus into , l_val , r_val
+        into.add_code     res.is l_val + r_val
+#        code = res.plus into , l_val , r_val
+        code = res
       when "-"
         res = Vm::Integer.new(context.function.next_register)
         code = res.minus into , l_val , r_val
diff --git a/lib/core/kernel.rb b/lib/core/kernel.rb
index dc78956d..75feb7e2 100644
--- a/lib/core/kernel.rb
+++ b/lib/core/kernel.rb
@@ -23,8 +23,8 @@ module Core
         
       #TODO this is in the wrong place. It is a function that returns a function object
       #   while all other methods add their code into some block. --> kernel
-      def putstring context
-        function = Vm::Function.new(:putstring , [Vm::Integer , Vm::Integer ] )
+      def putstring context , string = Vm::Integer , length = Vm::Integer
+        function = Vm::Function.new(:putstring , [string , length ] , string)
         block = function.body
         # should be another level of indirection, ie write(io,str)
         ret = Vm::CMachine.instance.write_stdout(block)
@@ -32,16 +32,16 @@ module Core
         function
       end
 
-      def putint context
-        function = Vm::Function.new(:putint , [Vm::Integer , Vm::Integer ] )
-        block = function.body
+      def putint context , arg = Vm::Integer
+        arg = Vm::Integer.new( 0 )
+        function = Vm::Function.new(:putint , [arg ] , arg )
         buffer = Vm::StringConstant.new("           ")
         context.program.add_object buffer
-        str_addr = Vm::Integer.new(0)                  # address of the 
+        str_addr = Vm::Integer.new(1) 
         context.str_addr = str_addr
-        reg1 = Vm::Integer.new(1)
+        reg1 = Vm::Integer.new(2)
         itos_fun = context.program.get_or_create_function(:utoa)
-        block.instance_eval do 
+        function.body.instance_eval do 
           mov( reg1 ,  str_addr ) #move arg up
           add( str_addr ,  buffer ,nil )   # string to write to
           add( str_addr ,  str_addr ,  (buffer.length-3))  
@@ -50,7 +50,7 @@ module Core
           add( str_addr ,  buffer , nil )   # string to write to
           mov( reg1 ,  buffer.length )
         end
-        ret = Vm::CMachine.instance.write_stdout(block)
+        ret = Vm::CMachine.instance.write_stdout(function.body)
         function
       end
 
diff --git a/test/runners/fibo_while.rb b/test/runners/fibo_while.rb
index 6dccce9a..399f0aa5 100644
--- a/test/runners/fibo_while.rb
+++ b/test/runners/fibo_while.rb
@@ -5,10 +5,9 @@ def fibonaccit(n) # n == r0
     tmp = a       # r3 <- r1
     a = b         # r1 <- r2
     b = tmp + b   #  r4 = r2 + r3  (r4 transient)  r2 <- r4 
-    tmp = putint(b)
-    putstring(tmp)   
-    n = n - 1      # r2 <- 0   ????   #call ok  
-  end             #r5 <- r0 - 1                  # r0 <- r5
-end
+    putint(b)
+    n = n - 1      # r0 <- r2   for call,    #call ok  
+  end             #r5 <- r0 - 1    n=n-1 through r5 tmp              
+end               # r0 <- r5
 
 fibonaccit( 10 )
diff --git a/test/test_runner.rb b/test/test_runner.rb
index 9e694d91..a687da02 100644
--- a/test/test_runner.rb
+++ b/test/test_runner.rb
@@ -22,6 +22,7 @@ class TestRunner < MiniTest::Test
     parser = Parser::Crystal.new
     program = Vm::Program.new "Arm"
     syntax  = parser.parse_with_debug(string)
+    assert syntax
     parts   = Parser::Transform.new.apply(syntax)
     # file is a list of expressions, all but the last must be a function
     # and the last is wrapped as a main
@@ -37,7 +38,7 @@ class TestRunner < MiniTest::Test
     program.link_at( 0 , program.context )
     
     binary = program.assemble(StringIO.new )
-
+    assert binary
     writer = Elf::ObjectWriter.new(Elf::Constants::TARGET_ARM)
     blocks = program.functions.collect{ |f| [f.entry , f.exit , f.body] } 
     blocks += [program.entry , program.exit , program.main]