z/OS TSO/E REXX Reference
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Entry specifications

z/OS TSO/E REXX Reference
SA32-0972-00

For the user ID replaceable routine, the contents of the registers on entry are described below. The address of the environment block can be specified in either register 0 or in the environment block address parameter in the parameter list. For more information, see Using the environment block address.
Register 0
Address of the current environment block
Register 1
Address of the parameter list
Registers 2-12
Unpredictable
Register 13
Address of a register save area
Register 14
Return address
Register 15
Entry point address

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