On Thu, 26 Jun 2014 08:53:35 -0700, Phil Smith <[email protected]> wrote:
>* In the first module, soon after the PC: > ESAR R1 Get secondary ASID > STH R1,SRQESASN And remember that > MVI SRQERSVA+8,X'37' Set a magic value > STH R1,SRQERSVA+9 Remember the SASN > MVI SRQERSVA+11,X'73' And another magic value > > SAC 512 Begin AR-mode execution > LAM R2,R2,=F'2' Home space > > USING ACEE,R2 > > CLC ACEEACEE(4),=CL4'ACEE' Does it look like an ACEE?? > BE *+8 Yes, great, continue > EX *-*,* Ouch, ABEND time > > ST R2,SRQERSVA+0 Remember the ACEE address > MVC SRQERSVA+4(4),SRQEACEE Remember saved ACEE address >* So: >* 1) We know that the ACEE in R2 looks like an ACEE >* 2) We have saved both it and SRQEACEE in SRQERSVA >--------- >* Later on, in the other module: > SAC 512 Begin AR-mode execution > L R4,SRQEACEE Get ACEE address in caller's home space > LH R1,SRQESASN Get caller's SASN > SAR R4,R1 Set that in AR4 > LA R3,SRQERSVA Point to our saved stuff > DC X'00' >* In the dump, at 0(R3): >* 007FC6F0 007FC6F0 37004573 (and R1 = 0045 as expected) >* So SRQEACEE is still what we expect (and I've done various checks >* to be sure something ELSE isn't stepping on that storage), and >* SRQESASN is correct (that is, matches what we got from the ESAR >* back in the first module) >* >* BUT R4 is pointing to all zeroes! I don't think you've proven that SRQEACEE is still what you expect. You've shown us SRQERSVA, where you saved a copy of SRQEACEE, and a copy of the ACEE address. And SRQERSVA is apparently still good. But you haven't actually shown us SRQEACEE (unless it is defined as being at SRQERSVA, which seems unlikely), and when you loaded SRQEACEE you got 0 (as shown by what's in R4). So it seems like something _has_ stepped on SRQEACEE. (It is also not clear where you got the ACEE address from in the first place; that is also important, and often done incorrectly in cross-memory code, and it would be good to see that code.) (And, as another list member pointed out, an ASN is not the same as an ALET, so your usage of SRQESASN seems suspect.) -- Walt ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
