Re: [Xen-devel] [Patch][0/2]implement dump_execution_state() on ia64

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 27/3/08 16:56, "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx> wrote:

>> Can you carefully explain why the interface changes are required?
>> 
> IA64 needs unwind infomation to show the Calltrace.
> To make the unwind infomation, we needs switch stack and pt_regs.
> So if possible, I want to use pt_regs at geting a interrupt.
> 
> I make many interface change because debug-key use IPI.
> But I just want to use pt_regs.

There is already a function which does what you want (i.e., takes a
cpu_user_regs pointer) -- it's called show_execution_state().

On x86 we implement dump_execution_state() by forcing an exception (by
executing an invalid opcode) and dumping the calltrace from within the
exception handler. This works because the exception handler has a
cpu_user_regs pointer and hence can call show_execution_state(). We use the
same trick for handling BUG() and ASSERT(). The code concerned is in
arch/x86/traps.c:do_invalid_op().

Can a similar thing be done on ia64?

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel