to the function in r2. Further arguments are beginning in r3 then.
R13 is used as frame pointer when GCC compiles w/o optimization
R14 is used as "PSW", displaying the CPU status.
- R15 is used implicitely as stack pointer. */
+ R15 is used implicitly as stack pointer. */
E_R0_REGNUM,
E_R1_REGNUM,
E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM,