At 15:46 +0000 on 02/15/2015, [email protected] wrote about An
Interesting Technique:
I stumbled across a small routine whose function is to issue a
STIMER and return to the caler, when the Time Limit Expires. What I
found interesting was the way this routine saved the return code.
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STIMER WAIT,DINTVL=WAITTIME .Wait till the end
L R13,SAVE+4 .Return to caller
ST R15,16(,R13) <===HERE
LM R14,12,12(R13)
BR R14
L R14,12(R13)
LM R0,R12,20(R13)
Works just as well. I also have the impression (possible wrong) that
there is a parm on the RETURN macro that does the same thing (ie: Use
the current contents of R15 as the return code).
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Before restoring the callers registers, Register 15
is stored in the Register 15 Slot of the Callers Save Area.
OR that is how it appears to me.
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Has Anyone seen this technique ?
Any comments on using this technique ?
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Just curious
Paul
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