[PATCH] TLS fix for debugging thread-local variables

[Pete Eberlein]

When debugging a program on PowerPC with thread-local storage declared using 
"__thread", attempting to print a thread-local variable results in the the 
message "Cannot find thread-local storage for Thread <snip>: capability not 
available".  This can be traced back to libc nptl_db/td_thr_tls_get_addr.c which 
gdb uses to look up the address of the TLS.  The function returns TD_NOCAPAB due 
to a mismatch in size between the DTV pointer and the size recorded in the db 
description.  The problem lies in nptl_db/db_info.c which initializes the db 
with the sizeof the union dtv.  Instead it should be the sizeof a pointer to 
union dtv.

-- 
Pete Eberlein
IBM Linux Technology Center
Linux on Power Toolchain

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