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    SubjectRe: [RFC PATCH 0/3] Add support for dwarf compat mode unwinding
    On Mon, Jan 20, 2014 at 09:21:59PM +0000, Jean Pihet wrote:
    > In the case of unwinding the debug info from a binary that has a different
    > address size than the current native platform, it is needed to record
    > it in the address space struct, in order to correctly parse the debug
    > info later. This mode is known as compat mode.

    Terminology issues here.... compat mode isn't really that well defined, but
    typically involves a different kernel ABI. That doesn't necessarily affect
    the address size.

    > This is the case when e.g. profiling an ARMv7 binary that runs on an
    > ARMv8 (aka AARCH64) platform.

    ARMv8 != AArch64


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