[RFA] Prevent runaway (infinite loop) in mips-tdep.c

[Daniel Jacobowitz]

On Wed, Apr 21, 2004 at 12:20:53AM +0000, Michael Snyder wrote:
> Hi Andrew,
> 
> This change will prevent the caller(s) of mips_mdebug_frame_id from
> infinite-looping when we get badly lost on the stack frame.
> 

> 2004-04-21  Michael Snyder  <msnyder@redhat.com>
> 
> 	* mips-tdep.c (mips_mdebug_frame_cache): Call error to prevent
> 	infinite looping by caller.
> 	(heuristic_proc_start): Warning() already prefixes "Warning: ".

Since I have some patches to make this "I'm not sure how" case into a
working part of the unwinder, I don't much like this.  They got hung up
on the question of how to trust proc_desc's when we might be in the
prologue.

One time where this case occurs is in backtracing from a NULL pointer
dereference, which happens in the GDB testsuite now.


-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer