GDB_REG_A0
if (regnum >= GDB_REG_A0 && regnum < GDB_REG_S2)
kdb_frame->tf_a[regnum - GDB_REG_A0] = regval;
if (regnum >= GDB_REG_A0 && regnum < GDB_REG_S2)
return (&kdb_frame->tf_a[regnum - GDB_REG_A0]);