Julian Seward writes:

> complaining that r2 contains an undefined value.  And it's true;
> it is not written at all in the procedure in which this is
> reported.  Which is odd.  AFAIK r2 is not an argument register
> and it didn't used to have any particular meaning in the ppc32 ELF
> ABI.

It's now used as the TLS pointer.  It should get initialized for the
main thread in glibc, and for other threads by the clone() system
call.  Maybe the CLONE_SETTLS flag isn't handled properly by the
syscall wrapper for clone?  It should cause r2 in the child to be
initialized to the value of the 4th argument (for 32-bit processes;
64-bit processes use r13 instead).

Paul.

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