Re: user-mode debugging

[Keith Owens <kaos@xxxxxxx>]

On Thu, 06 Jun 2002 16:23:53 -0700, 
Ethan Solomita <ethan@xxxxxxxxxxxxxxx> wrote:
>       You should be able to get the user's registers from "rd u". Then you 
> can 
>see about doing the backtrace by hand. Is it possible to find a stack 
>frame pointer for the user space, and then pass it in as an argument to 
>"bt"?

User space stack frames require a process context to access them.  kdb
runs out of interrupt context, accessing user space is fragile at best.
bt on ia64 needs the unwind data and kdb has no idea where that is for
user space, it only knows about kernel unwind data.