dwarf2 frame unwinder assumptions on SP

Daniel Jacobowitz drow@false.org
Mon Jul 11 14:51:00 GMT 2005


On Mon, Jul 11, 2005 at 04:43:55PM +0200, Christophe LYON wrote:
> 
> Hi all,
> 
> I am working on the connection of the dwarf2 frame unwinder
> to our GDB port, and I have trouble with some assumptions
> made by GDB about SP.
> 
> Currently, in my x-tdep.c I have:
>   set_gdbarch_unwind_pc(gdbarch, x_unwind_pc);
>   frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);

It sounds like you need to set a "frame base" sniffer also, other than
the dwarf one.  The dwarf2 frame unwinder does not set anything related
to the "frame base" used by symbolic debug information; it only unwinds
the stack pointer as best it can.

Does "print $sp" work correctly when unwinding?


-- 
Daniel Jacobowitz
CodeSourcery, LLC



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