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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Go for it, Michael!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">FYI, the x86_64 build of LLDB will have limited success with i386 inferiors, but it’s a pretty good starting point (i.e. test/functionalities/registers passes).
In this case, ptrace calls populate the 64-bit register set, and the RegisterContext_x86_64 class uses offsetof to associate the i386 register set with the LS bytes of the associated 64-bit registers. However, this isn’t correct because “The DWARF and GCC
register numbers need to use the i386 register numbering schemes otherwise all info parsed from EH frame and DWARF will be incorrect when they don't match up. – Greg Clayton”.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The i386 build of LLDB should use RegisterContext_i386. Similarly, a future remote i386 target should use RegisterContext_i386. However, this class is just
stubbed in. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">An eventual goal is to abstract a dynamic register set that can be used consistently for native local and remote debugging in a platform-independent manner.
Also, for core file support across platforms, we’ll want a register set hierarchy that is distinct from platform dependencies like ProcessMonitor. This was implemented for MachO, and Greg provided a skeleton patch for this purpose on the lists. Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ashok<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> lldb-dev-bounces@cs.uiuc.edu [mailto:lldb-dev-bounces@cs.uiuc.edu]
<b>On Behalf Of </b>Michael Sartain<br>
<b>Sent:</b> Friday, August 23, 2013 12:49 AM<br>
<b>To:</b> lldb-dev@cs.uiuc.edu<br>
<b>Subject:</b> [lldb-dev] register read on 32-bit Linux<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This is currently calling into the POSIX RegisterContext_x86_64 and returning all the 64-bit registers.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm guessing this is known already. Curious if someone is already working on this or has a plan for fixing it before I jump in?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks!<o:p></o:p></p>
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