Messages in this thread | | | Date | Mon, 7 Sep 2015 09:42:18 +0200 | From | Ingo Molnar <> | Subject | Re: Dealing with the NMI mess |
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* Maciej W. Rozycki <macro@linux-mips.org> 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
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