FRAME_A2
{ "a2", &ddb_regs.tf_regs[FRAME_A2], FCN_NULL },
FRAME_A2,
regp->r_regs[R_A2] = framep->tf_regs[FRAME_A2];
framep->tf_regs[FRAME_A2] = regp->r_regs[R_A2];
frame->tf_regs[FRAME_A2] = (u_int64_t)scp;
FRAME_A2,
args[2] = framep->tf_regs[FRAME_A2];
FRAME_A0, FRAME_A1, FRAME_A2, FRAME_A3,