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<title>10.1.1 What is a relocatable code unit?  </title>

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<h3>
  <a name="1204433"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">10.1.1 	 What is a relocatable code unit?</font>
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<p>
  <a name="1204434"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">An RCU is a self contained unit of code and data that may be loaded and run from within another running application. The RCU can be loaded at any memory location within the application's memory map, that is, its load point does not need to be known at link time, unlike a normal linked unit (<font size=2 face=Courier><strong>.lku</strong></font>) or ROM image.</font>
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  <a name="1204435"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">An RCU has a single entry point which can accept and return arbitrary arguments. An RCU is limited to one code section and one combined data and BSS section.</font>
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  <a name="1204436"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">ANSI C, C++ or assembler source files are compiled and linked by <strong>st20cc</strong> to produce an RCU file. <strong>st20cc</strong> generates a header at the start of the RCU file which describes the structure of the remainder of the file. RCU files are given the extension <font size=2 face=Courier><strong>.rcu</strong></font>.</font>
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  <a name="1206220"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><a href="rcu3.htm#1206269"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Figure

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