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