On Thu, 11 May 2017 17:08:41 -0500, John McKown wrote:

>     STM R0,RF,12(RD) SAVE ALL REGS.
>     L R3,0(,R1) POINT TO RETURN AREA
>     ​MVC 0(64,R3),12(RD) MOVE REGS AT ENTRY
>     SLR RF,RF
>     BR RE
>
>This does not use standard linkage, but is that really necessary?

You are going to store 16 registers (64 bytes) at offset 12 in a 
72-byte save area? What is in the word that you will clobber?

-- 
Tom Marchant

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