"IBM Mainframe Assembler List" <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on
11/08/2023 04:31:21 PM:
> If in the mainline code you need the address of any exit routine,
> use “L Rx,=A(exit name)” rather than simply “LA Rx,exitname”.
I get the rest of what you said. But could you explain why the
above is needed? It seems related to using a V address constant for an
external subroutine which is resolved by the linkage editor. To start
with, I guess that this is because of limiting the range of the code base?
Does the linkage editor still get involved in adjusting the =A constant
after the fact?
I do have the following in the mainline code when I set up to call
to the IBM system utility. Obviously, I could simply change this as you
describe but I wouldn't know why -- and I always like to know why. ;-)
LA R2,IPTEXIT GET EXIT RTN ADDRESS
LA R3,IPTAREA GET I/O AREA ADDRESS
STM R2,R3,INLCIPTA PUT ADDRESSES IN CONTROL BLOCK
LA R2,LSTEXIT GET EXIT RTN ADDRESS
LA R3,LSTAREA GET I/O AREA ADDRESS
STM R2,R3,INLCLSTA PUT ADDRESSES IN CONTROL BLOCK
LA R2,PCHEXIT GET EXIT RTN ADDRESS
LA R3,PCHAREA GET I/O AREA ADDRESS
STM R2,R3,INLCPCHA PUT ADDRESSES IN CONTROL BLOCK
Sincerely,
Dave Clark
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