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  2. MI400
  3. February 2006

Re: Patched Programs - Yet another spin


-----Original Message-----
From: mi400-bounces@xxxxxxxxxxxx [mailto:mi400-bounces@xxxxxxxxxxxx]On
Behalf Of Dave McKenzie
Sent: Wednesday, February 15, 2006 10:25 AM
To: MI Programming on the AS400 / iSeries
Subject: Re: [MI400] Patched Programs - Yet another spin


>The trick of putting PowerPC instructions in a user space won't work
>anymore because there's a new bit in the hardware page tables (new in
>V5R3) called "Nex," which I think stands for "No execute."  The bit is 1
>for user spaces, meaning that code in a user space can't be executed.

that's no fun!

What is the hardware page table?  Can the patched code in the RPG program
first change the object type and sub type of the user space to *PGM?  Kind
of as a boot strap type process where you are coding a permanent user space
executable that can turn off the NEX bit in other hardware page table
entries.

-Steve

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