On 5/1/2013 9:27 AM, Etienne Thijsse wrote:
Hi all,
I am trying to call an assembler function from C:
C-code (bla.c):
#pragma linkage(BLA,OS)
main()
{
BLA();
printf("No crash.\n");
}
Assembler code (bla1.s):
BLA CSECT
BLA MODE ANY
SAVE (14,12)
BALR 3,0
USING *,3
ST 13,SAVE+4 <<<<< crashes here
* todo: add useful code here
L 15,=X'01'
L 13,SAVE+4
RETURN (14,12),RC=(15)
SAVE DS 18F
END
So the only code in this assembler source is the "standard linkage" stuff,
which I got from the "MVS Assembler Language" book.
Ummm. Which book is that? There is the MVS Assembler Services Guide
and the MVS Assembler Services Reference (2 volumes), but I don't
see 'MVS Assembler Language' as a doc.
In any case, none of the examples in these books quite match
what you show.
Perhaps your cut and paste is off, but at the least
'MODE' should be 'AMODE'; it's pretty unusual, but not wrong,
to choose reg. 3 for your base. A more traditional version
might be:
BLA CSECT
BLA AMODE ANY
SAVE (14,12)
LR 12,15
USING BLA,12
ST 13,SAVE+4 <<<<< crashes here
* todo: add useful code here
L 15,=X'01' <== not sure what you intend to happen here
<== perhaps better:
LA 15,1 <== would give a return code of '1'
L 13,SAVE+4
RETURN (14,12),RC=(15)
SAVE DS 18F
END
Still, I don't see any clear reason for your abend.
I compiled and linked this under OpenMVS like this:
cc bla.c bla1.s
which gives me an executable 'a.out' in the HFS.
Running this under OpenMVS crashes in the "ST 13,SAVE+4" line, SC04.
If I comment out that line and the corresponding L13,SAVE+4 line, it does not crash
anymore.
I don't understand this... This ST line is part of the standard linkage
'protocol'; the area where the ST stores is declared in the SAVE DS 18F line at
the bottom --- Why does this crash?
What is weirder still is that I can copy a.out to a PDSE member, and submit it
with some JCL that has CEE.SCEELIB in its STEPLIB; this does not crash, without
SCEELIB it also crashes.
Adding CEE.SCEELIB to the STEPLIB environment variable in OpenMVS however does
not help, it keeps crashing, SC04.
Anyone have an idea?
Thanks,
Etienne
1. What version of z/OS are you running?
2. The z/OS UNIX Command Reference doc points out that 'cc' command
"is fully supported for compatibility with older UNIX systems.
However, it is recommended that the c89 command be used instead"
3. The default binder option is, essentially, NORENT, so the other
suggestion of an extra step to bind this way is not necessary
You might check out the values in the environment variables that
influence how the c89 command works.
--
Kind regards,
-Steve Comstock
The Trainer's Friend, Inc.
303-355-2752
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