On Sat, 31 Aug 2019 01:16:55 +0000, Jon Perryman wrote:

>>What you describe as being able to run code in any 
>>address space sounds more like scheduling an SRB.
>
>SRB is one method to execute authorized code in any address space 
>but surely you must be familiar with others such as SVC, PC and
>IEFSSREQ. Or are you suggesting that getmain and storage macro's
>somehow use an SRB to execute authorized code in any address
>space?

SVC allows you to execute authorized code in YOUR address space. 
It does not allow you to execute code in any arbitrary address space. 
If you mean that an SVC can be issued in any address space, I hope 
you can see why I didn't understand what you meant.

Likewise, PC can be used to execute authorized code in either your 
address space or a specific other address space, depending on how 
the PC routine was established. It does not allow you to execute code 
(authorized or not) in any arbitrary address space.

I'm not familiar enough with IEFSSREQ to comment about it.

-- 
Tom Marchant

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