On 6/26/2013 8:06 PM, DASDBILL2 wrote:
Instead of zeroing your caller's R13, how about doing a LC R 13,13? Then if someone adds to your module and attempts to store into your module's (non-existent) save area, the new code will likely get a S0C4 on the store. Then when your original code returns to your caller, you do another LC R to restore R13 as it was upon entry. Or maybe do a LNR at entry and a LPR upon return?
AFAIK, there is only one 4K range of virtual addresses guaranteed to generate 0C4 now and forever: 7FFFF000 - 7FFFFFFF.
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