You are correct, PR unstacks Regs 2-14 and Access Regs 2-14.
________________________________
From: IBM Mainframe Assembler List <[email protected]> on behalf
of Dave Clark <[email protected]>
Sent: Friday, January 21, 2022 11:27 AM
To: [email protected] <[email protected]>
Subject: Re: BAKR/PR and R15 Return code
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David L Clark/it/crp/WinWholesale wrote on 01/21/2022 12:18:30 PM:
> Previously, when using STM/LM for the caller's 72-byte save area, I
> would store my R15 return code in the caller's save area before
> issuing LM/BR to return to caller. My question is, in a BAKR/PR
> situation, how do you pass back what would normally be a register 15
> return code? I'm trying to wade though the information on the PR
> instruction in hopes of finding this answer, but there is quite a
> lot of it -- over 3 pages.
Oh, it looks like only registers 2-14 are unstacked by the PR
instruction. So, anything in register 15 (like a return code) would
remain. Let me know if I've got that wrong. Thanks.
Sincerely,
Dave Clark
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Dayton, Ohio 45439 USA
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