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    SubjectRe: Dealing with the NMI mess

    * 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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