* Frame unwind and the sentinal frame.
@ 2006-06-30 18:42 Paul Breed
2006-06-30 19:05 ` Daniel Jacobowitz
0 siblings, 1 reply; 2+ messages in thread
From: Paul Breed @ 2006-06-30 18:42 UTC (permalink / raw)
To: gdb
I'm working on a GDB remote stub for the coldfire. (Think 68K)
When the system does a bt (back trace )
or an MI stack-info-depth
It eventually walks off the end of the frames and generates an error message
Previous frame inner to this frame (corrupt stack?)
How is GDB supposed to detect the "Last" frame in the stack,
I think this is called the sentinal frame?
Paul
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Frame unwind and the sentinal frame.
2006-06-30 18:42 Frame unwind and the sentinal frame Paul Breed
@ 2006-06-30 19:05 ` Daniel Jacobowitz
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Jacobowitz @ 2006-06-30 19:05 UTC (permalink / raw)
To: Paul Breed; +Cc: gdb
On Wed, Jun 28, 2006 at 04:47:36PM -0700, Paul Breed wrote:
> I'm working on a GDB remote stub for the coldfire. (Think 68K)
>
> When the system does a bt (back trace )
> or an MI stack-info-depth
>
> It eventually walks off the end of the frames and generates an error message
>
> Previous frame inner to this frame (corrupt stack?)
>
> How is GDB supposed to detect the "Last" frame in the stack,
The right answer depends on your architecture: a NULL frame pointer, a
zero PC, or a function marked as an ELF entry point are all reasonable
choices. Then, of course, you have to make sure GDB agrees with you on
the proper convention. As you'll see in the list archives that can
sometimes be a bit iffy.
> I think this is called the sentinal frame?
No - that's at the other end of the stack, actually. It's more of a
GDB internal detail.
--
Daniel Jacobowitz
CodeSourcery
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2006-06-30 18:42 Frame unwind and the sentinal frame Paul Breed
2006-06-30 19:05 ` Daniel Jacobowitz
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