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Re: panic! panic! panic! sigh.. panic!
On Mon, Sep 22, 2008 at 07:27:45AM -0400, Greg Troxel wrote:
> The kernel doesn't save any of these registers on entry into the kernel
> (via an interrupt or system call) and doesn't restore them on exit. It
> also doesn't save and restore them on internal scheduling. If you
> compile the kernel with MMX or SSE<n> enabled the kernel will sooner
> or later globber some state and you get a panic.
> It would be nice if the kernel had some gcc flags or similar would
> actually prevent compilation if any unsafe operations would be emitted.
Is is possible to enable the FP absent (or similar) trap?
Like the one I hit of solaris where sun's C compiler failed to
evaluate a constant FP expression at compile time :-(
David Laight: david%l8s.co.uk@localhost
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