Re: Apparent kernel bug with GDB on ppc405

On Wed, 2007-10-24 at 13:34 -0700, David Daney wrote:

First of all I have never used a similar configuration so this may be 
totally off base.  But...

If the icache is virtually indexed, then I think there are only two
ways 
to invalidate it.  The first is from the context of the debugged
process 
where the page is mapped at the location the target program will see
it. 
   If you try to invalidate from the context of the debugger, the
page 
will most likely not be mapped at the virtual address of the target 
program so you might have to invalidate the *entire* icache.

Yup, sounds likely. We don't handle that virtual icache well at all in
linux. Things tend to work by mere luck. I have various ideas to fix
that but haven't actually implemented them.

Ben.