defaria.com/blogs/Status/archives/000326.html

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  12    <title>Status for Andrew DeFaria: HybridOS Binary Comparison problems</title>
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  47                      <div class="entry" id="entry-326">
  48                         <h3 class="entry-header">HybridOS Binary Comparison problems</h3>
  49                         <div class="entry-content">
  50                            <div class="entry-body">
  51                               <ul>
  52   <li>Managed to perform binary comparison of HybridOS</li>
  53 </ul>
  54                            </div>
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  56                               <h3>HybridOS Binary Comparison</h3>
  57
  58 <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>
  59
  60 <div class="code"><pre>
  61 tomcat:strings -a orig.uipc_usrreq.o | grep Header
  62 $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 $
  63 tomcat:strings -a new.uipc_usrreq.o | grep Header
  64 $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 $
  65 </pre></div>
  66
  67 <p>The changes are as follows:</p>
  68
  69 <ol>
  70   <li>CVS Repository name changed from los178-cvs -> hybrid-os-cvs (<font color="blue">blue</font>)</li>
  71
  72   <li>Revision changed from whatever it was -> 1.1 (<font color="orange">orange</font>) All revisions for HybridOS are now 1.1</li>
  73
  74   <li>Date changed to reflect time of cvs commit to new CVS repository (<font color="green">green</font>)</li>
  75
  76   <li>User changed from whatever it was -> adefaria (<font color="purple">purple</font>) since I was the user to perform the commit</li>
  77 </ol>
  78
  79 <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>
  80
  81 <ol>
  82   <li>/sys/lib/libcsp_970.a (context_asm.o)</li>
  83
  84   <li>/sys/lib/libcsp_970.a (csp_cpu_asm.o)</li>
  85
  86   <li>/sys/lib/libcsp_970.a (flih.o)</li>
  87
  88   <li>/sys/lib/libcsp_970.a (fpu_asm.o)</li>
  89
  90   <li>/sys/lib/libcsp_970.a (launch_asm.o)</li>
  91
  92   <li>/sys/lib/libcsp_970.a (tlbmiss.o)</li>
  93 </ol>
  94
  95 <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>
  96
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 100                            <span class="post-footers">Posted by  on March 30, 2005  4:59 PM</span> <span class="separator">|</span> <a class="permalink" href="http://defaria.com/blogs/Status/archives/000326.html">Permalink</a>
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