Get backtrace at PLT and stepi into PLT

[Daniel Jacobowitz]

On Tue, Jul 21, 2009 at 10:57:06AM +0800, Thinker Li wrote:
> You can not do backtrace when you stop at PLT with GDB.
> arm_stub_unwind_sniffer create a frame with NORMAL_FRAME type for
> PLT.  But, when we do backtrace, get_prev_frame() will check if
> this frame inside_entry_func.  Since we can not found any symbol for
> PLT, it:s func address is 0, and entry_point_address() is also 0 if
> symfile_objfile is NULL (no main symbol table).  It makes problem on
> backtracing.

Thanks, that's much clearer.  That's where the bug is.  An unknown
function address should not be inside_entry_func.

-- 
Daniel Jacobowitz
CodeSourcery