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I'm sorry for all the back-and-forth on this, but it seems we do have to implement a Linux-specific fallback to that; I don't see how we can do a generic default. To do so, you'll need to let the gdbarch variable default to NULL, and in linux_nat_do_thread_registers perform the fpregset fallback if that is the case. ppc and i386 would then be the only architectures that install the new gdbarch variable; over time, the remaining Linux platforms should follow suite and we can remove the fallbacks.
-- Carlos Eduardo Seo Software Engineer IBM Linux Technology Center
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