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    SubjectRe: [RFC][PATCH] x86: don't destroy %rbp on kernel-mode faults
    Vegard Nossum wrote:
    > Hi,
    > The RFC part of this patch is: Does anybody see why touching %rcx would
    > be bad? It certainly looks like %ecx is free. This fixes the stacktrace
    > problem I was seeing, and Pekka tested a bootup to userspace. (Pekka also
    > did half of the debugging. When will git allow multiple authors for a
    > patch? :-))

    The patch is ok, but I'm sure there's lots of other assembler code that
    destroys %rbp when it was saved elsewhere.

    When I wrote all the assembler the assumption was always that a real
    unwinder would be used for backtraces, not frame pointer.


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