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  70                   <h2 itemprop="name" class="asset-name entry-title">HybridOS Binary Comparison problems</h2>
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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2005-03-30T16:59:02-08:00" itemprop="datePublished">March 30, 2005</time></li>
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  85   <li>Managed to perform binary comparison of HybridOS</li>
  86 </ul>
  87                   <h3>HybridOS Binary Comparison</h3>
  88
  89 <p>HybridOS has been checked in and built. As you know the binary comparison procedure described in the GS: LOS178 Impact Summary discovered more differences. Specifically 227 .o files had differences. Further investigation revealed that the action of committing the sources to CVS caused $Header/ident strings to change. The following describes the changes to the $Header strings due to cvs commit:</p>
  90
  91 <div class="code"><pre>
  92 tomcat:strings -a orig.uipc_usrreq.o | grep Header
  93 $Header: /cvs/<font color="blue"><b>los178-cvs</b></font>/los178/sys/networking/tcpip/general/uipc_usrreq.c,v  <font color="orange"><b>1.1.1.1</b></font> <font color="green"><b>2004/03/03 00:59:24</b></font> <font color="purple"><b>emooring</b></font> Exp $
  94 tomcat:strings -a new.uipc_usrreq.o | grep Header
  95 $Header: /cvs/<font color="blue"><b>hybrid-os-cvs</b></font>/los178/sys/networking/tcpip/general/uipc_usrreq.c,v <font color="orange"><b>1.1</b></font> <font color="green"><b>2005/03/30 00:39:03</b></font> <font color="purple"><b>adefaria</b></font> Exp $
  96 </pre></div>
  97
  98 <p>The changes are as follows:</p>
  99
 100 <ol>
 101   <li>CVS Repository name changed from los178-cvs -> hybrid-os-cvs (<font color="blue">blue</font>)</li>
 102
 103   <li>Revision changed from whatever it was -> 1.1 (<font color="orange">orange</font>) All revisions for HybridOS are now 1.1</li>
 104
 105   <li>Date changed to reflect time of cvs commit to new CVS repository (<font color="green">green</font>)</li>
 106
 107   <li>User changed from whatever it was -> adefaria (<font color="purple">purple</font>) since I was the user to perform the commit</li>
 108 </ol>
 109
 110 <p>Using objdump once again to disassemble these .o files and comparing the output left us with the following .o files that were still different:</p>
 111
 112 <ol>
 113   <li>/sys/lib/libcsp_970.a (context_asm.o)</li>
 114
 115   <li>/sys/lib/libcsp_970.a (csp_cpu_asm.o)</li>
 116
 117   <li>/sys/lib/libcsp_970.a (flih.o)</li>
 118
 119   <li>/sys/lib/libcsp_970.a (fpu_asm.o)</li>
 120
 121   <li>/sys/lib/libcsp_970.a (launch_asm.o)</li>
 122
 123   <li>/sys/lib/libcsp_970.a (tlbmiss.o)</li>
 124 </ol>
 125
 126 <p>Closer examination of these .o files reveals that the also contained ident strings in the text segment that had the same differences as the $Header differences described above. In other words the code was the same but the version strings and dates changed, as is expected.</p>
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