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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">PowerPC uses two alternate time base registers which are read from user space<o:p></o:p></p>
<p class="MsoNormal">by using PPC instructions mfatbu and mfatbl . However these instructions are<o:p></o:p></p>
<p class="MsoNormal">not supported by Valgrind.<o:p></o:p></p>
<p class="MsoNormal">CPU : e500mc<o:p></o:p></p>
<p class="MsoNormal">Here are the logs when an application executing such instruction is executed<o:p></o:p></p>
<p class="MsoNormal">with Valgrind 3.7.0:<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">dis_proc_ctl(ppc)(mfspr,SPR)(0x20F)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">disInstr(ppc): unhandled instruction: 0x7C0F82A6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> primary 31(0x1F), secondary 678(0x2A6)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== valgrind: Unrecognized instruction at address 0x10003dfc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== at 0x10003DFC: ??? (in /usr/bin/simple_crypto)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== by 0x1000181B: ??? (in /usr/bin/simple_crypto)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== by 0xFE179E7: ??? (in /lib/libpthread-2.13.so)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== by 0x40EEA9B: ??? (in /lib/libc-2.13.so)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== Your program just tried to execute an instruction that Valgrind<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== did not recognise. There are two possible reasons for this.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== 1. Your program has a bug and erroneously jumped to a non-code<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== location. If you are running Memcheck and you just saw a<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== warning about a bad jump, it's probably your program's fault.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== 2. The instruction is legitimate but Valgrind doesn't handle it,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== i.e. it's Valgrind's fault. If you think this is the case or<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== you are not sure, please let us know and we'll try to fix it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== Either way, Valgrind will now raise a SIGILL signal which will<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">==2204== probably kill your program.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">We have developed a patch to fix the issue and submitted<span style="font-size:10.0pt;font-family:"Courier New"">
</span>the patch upstream to Valgrind community for processing.<span style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><b>Aneesh Bansal<o:p></o:p></b></p>
<p class="MsoNormal"><b><img width="97" height="30" id="Picture_x0020_3" src="cid:image001.jpg@01CCD1E4.693FCF80"><o:p></o:p></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Plot No. – 18 | Sector-16 A, Noida – 201301<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Phone : 0120395 x3320<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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