The attached patch attempts to solve a bug that caused the gcore command 
to produce core files containing incorrect registers information. The 
problem caused incomplete backtraces when the files were read back into GDB.

I tested this patch with the gdb testsuite, and my addition to the 
gcore-thread.exp test case.

If OK, please commit it for me since I don't have write access.

Thanks,
	Daniel.

2009-11-06  Daniel Gutson <dgutson@codesourcery.com>

	gdb/
	* procfs.c (procfs_do_thread_registers): Added a call to fetch
	register values before saving them in the core file
	through the gcore command.
	(procfs_corefile_thread_callback): removed the backup of
	inferior_ptid before calling procfs_do_thread_registers since
	the function already saves and restores it before returning.

	gdb/testsuite/gdb.threads/
	* gcore-thread.exp: Added a test case in order to check
	if the core dump contains the registers values, and symbol
	lookup is working properly.

-- 
Daniel Gutson
CodeSourcery
www.codesourcery.com