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         * not necessary because:
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         * not necessary because:
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         * - spill traps operate only in the alternate global set,
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         * - spill traps operate only in the alternate global set,
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         * - preemptible trap handler switches to alternate globals
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         * - preemptible trap handler switches to alternate globals
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         *   before it explicitly uses %g7.
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         *   before it explicitly uses %g7.
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         */
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         */
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        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
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        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE -
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            - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
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            (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
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            STACK_ALIGNMENT));
 - 
 
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        write_to_ig_g6(sp);
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        write_to_ig_g6(sp);
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        write_to_ag_g6(sp);
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        write_to_ag_g6(sp);
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        write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
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        write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
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    }
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    }
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}
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}