RFC: %ebp-based backtrace patch

[Daniel Jacobowitz]

On Wed, Jul 08, 2009 at 08:53:30AM -0400, Daniel Jacobowitz wrote:
> On Wed, Jul 08, 2009 at 11:01:16AM +0200, Mark Kettenis wrote:
> > Before comitting this diff, I ran the testsuite, and noticed a
> > regression.  The problem is that if you do a function call through a
> > null-function-pointer or an otherwise corrupt function pointer, and
> > get a SIGSEGV, the backtrace no longer shows the frame that did the
> > function call.
> > 
> > Until we come up with a way to fix this issue, I'm not going to commit
> > the diff.
> 
> Hmm.  if (target_read_memory (pc, buf, 1)) ?  That's how a similar
> issue is handled on ARM, in arm_stub_unwind_sniffer.

Hi Mark,

I was looking through Ubuntu's local GDB patches and noticed this one
is still outstanding.  Will the above work?  I can test and
(hopefully) commit it, if you'd like.

-- 
Daniel Jacobowitz
CodeSourcery