* Maciej W. Rozycki <[email protected]> wrote:
> I did some work on this a few years ago, including emulating DR0-7 accesses
> in
> software down the JTAG handler upon a General Detect fault to keep the kernel
> both happy and away from real debug registers. ;) Yes, you can debug any
> software with this stuff, including the Linux kernel: set instruction and
> data
> breakpoints, single-step it, poke at all hardware registers, including
> descriptor registers not otherwise accessible (you can set funny modes for
> segments, also in the 64-bit mode), etc. One complication though is you
> operate
> on physical addresses when poking at memory, you can't ask the CPU's MMU to
> remap them for you (you can walk page tables manually of course, just as the
> MMU
> would).
Essentially the ICE breakpoint instruction enters SMM mode?
Thanks,
Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
