PSL_N
{ PSL_N, "SF ", "sf "}, /* sign flag */
#define PSL_USER (PSL_C | PSL_MBO | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_V)
tf->tf_ipsw &= ~(PSL_N|PSL_B|PSL_T);
frame->tf_ipsw |= PSL_N;
frame->tf_ipsw |= PSL_N;
frame->tf_ipsw |= PSL_N;
frame->tf_ipsw |= PSL_N;