Using OPS/REXX › The Interaction of OPS/REXX with Other Languages › Register Contents

Register Contents

On entry to a REXX function, the registers contain the following:

• Register 0 contains the address of an ENVBLOCK
• Register 1 contains the address of an EFPL
• Registers 2 through 12 are unpredictable
• Register 13 points to a save area for the routine
• Register 14 contains the return address to the caller
• Register 15 contains the entry point address of the routine