As stated earlier MVC does work! I am not sure why it abended the first time I
tried it. I retested because it just did not make since to me that it did not
work... So what if the base register is real big.
I've learned some more interesting (to me) information:
• RC=00000008-00040300 indicates memlimit reached (could not find this
documented).
• Undocumented that you need to be in supervisor state to code MEMLIMIT
on the IARST64 macro (but it makes since to me)
. The "NILH req,X'7F'" is very useful when switching from 31 bit
mode.
. The SAM24, SAM31, and SAM64 (switch mode) instructions are
very useful.
. The STORAGE macro worked (for XA storage). I was not sure it
would.
The following was extracted from a working program:
Program start:
TEST64 CSECT
TEST64 AMODE 64
TEST64 RMODE 24
...
STMG R14,R12,8(R13) SAVE REGISTERS
BALR R12,0
USING *,R12
*C SETUP SAVEAREA CHAIN
LA R1,SAVEREGS
STG R13,128(,1)
STG R1,136(,13)
MVC 4(4,R1),=C'F4SA'
LGR R13,R1
I was in SAM31 mode when the following was executed but I think it will work in
SAM64 mode as well.
*C Return to OS
LG R13,128(,13)
LG 14,8(0,13)
LMG 0,12,24(13)
BR 14
I hope this helps others attempting to code AMODE 64 programs.
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