VRISC_SP
idx = VRISC_SP;
VRISC_INT(VRISC_ADD_OP, special, 0, VRISC_SP));
veritefb_risc_forcestep(sc, VRISC_LD(VRISC_LW_OP, VRISC_SP, 0,
return veritefb_risc_readrf(sc, VRISC_SP);
case VRISC_SP: return "SP(dbg-scratch)";