PMC_TRAPFRAME_TO_FP
oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
fp = PMC_TRAPFRAME_TO_FP(tf);
oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
frame.fp = PMC_TRAPFRAME_TO_FP(tf);
sp = (uintptr_t *)PMC_TRAPFRAME_TO_FP(tf);
sp = (uintptr_t *)PMC_TRAPFRAME_TO_FP(tf);
fp = PMC_TRAPFRAME_TO_FP(tf);
oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);