System Control Blocks

Offset
Bytes and Field
Alignment Name
+0 (0) 4 XLISTLHO
+4 (+4) 4 XLISTLHl
+8 (+8) 4 XLISTAHO
+12 (+c) 4 XLISTABl
32 (20) 64 XRBREG
96 (60) nx8
REQUEST BLOCK -- MFT
Field Description, contents, Meaning
Program Extent List
(If the program was hierarchy block loaded, the
following fields exist.)
The length in bytes of the program extent contained
in hierarchy O. This does not include the RB length.
The length in tytes of the program extent contained
in hierarchy 1.
The address of the program extent contained in
hierarchy O. It is not the address of the RB.
The address of the program extent contained in
hierarchy 1.
End of LRB, LPRB, PRB Program Extent List.
IRE, SIRB, SVRB:
Save area for 16 general registers (0-15)
SVRB:
An extended save area, up to 6 doublewords, requested
for SVC routine.
RB -- MFT 277