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PR 1932/cpukit * cpu_asm.S: At some point the interrupt trap handler causes a window-overflow and the window overflow trap handler crashes when writing to 0. I found that this is because the WIM was bad, to the window overflow handler uses a uninitialized stack pointer in a window never used. * g3=CWP, not WIM * CWP is incremented by done_flushing no need doing that here also * I see no reason to create an additional stack frame (save) * Must turn off traps when updating WIM (maybe already done by caller?)