The validity check parameter list

The Parse Service Routine builds a three-word parameter list and places the address of this list into register 1 before branching to a validity checking routine. This three-word parameter list has the format shown in Table 1.

Table 1. Format of the validity check parameter list
Offset dec(Hex)	Number of bytes	Field name	Contents or meaning
0(0)	4	PDEADR	The address of the parameter descriptor entry (PDE) built by parse for this syntactically correct operand.
4(4)	4	USERWORD	The address of the user work area. This is the same address you supplied to the Parse Service Routine in the PPLUWA field in the parse parameter list.
8(8)	4	VALMSG	Initialized to X'00000000' by parse. Your validity checking routine can place the address of a second-level message in this field when it sets a return code of 4.