[hercules-os380] AM64 under z/Linux

[[e-mail] [hercules-os380]]

Is anyone here familiar with z/Linux? I specifically
want to know whether 32-bit programs are actually
run as AM31, and whether it would be possible to
run them as AM64 instead.

That might provide a better route to get the changes
into z/OS.

What's the best place to ask about z/Linux?

Thanks. Paul.

[Mike Schwab [e-mail] [hercules-os380]]

z/Linux (s390-x) is all 64 bit. No history of using high order bit.
On S/390 was restricted by hardware to 31 bit. Application may still
be 32 bit compilers.

Post by ***@yahoo.com.au [hercules-os380]
Is anyone here familiar with z/Linux? I specifically
want to know whether 32-bit programs are actually
run as AM31, and whether it would be possible to
run them as AM64 instead.
That might provide a better route to get the changes
into z/OS.
What's the best place to ask about z/Linux?
Thanks. Paul.
------------------------------------
------------------------------------
------------------------------------
Yahoo Groups Links

[[e-mail] [hercules-os380]]

z/Linux (s390-x) is all 64 bit. No history of using high order bit.
On S/390 was restricted by hardware to 31 bit. Application may still
be 32 bit compilers.

So the 32-bit applications produced with 32-bit
compilers are running in AM64?

So the compilers generate code that doesn't use
negative indexes?

Thanks. Paul.

[Mike Schwab [e-mail] [hercules-os380]]

No idea.

Post by ***@yahoo.com.au [hercules-os380]

z/Linux (s390-x) is all 64 bit. No history of using high order bit.
On S/390 was restricted by hardware to 31 bit. Application may still
be 32 bit compilers.

So the 32-bit applications produced with 32-bit
compilers are running in AM64?
So the compilers generate code that doesn't use
negative indexes?
Thanks. Paul.
------------------------------------
------------------------------------
------------------------------------
Yahoo Groups Links

[Amrith [e-mail] [hercules-os380]]

I don't think there are any cross compilers available with free z Linux distos. The ones provided produce ELF.
--------------------------------------------
On Tue, 5/15/18, ***@yahoo.com.au [hercules-os380] <hercules-***@yahoogroups.com> wrote:

Subject: [hercules-os380] AM64 under z/Linux
To: hercules-***@yahoogroups.com
Date: Tuesday, May 15, 2018, 10:08 PM


 









Is anyone here familiar with z/Linux? I
specifically

want to know whether 32-bit programs are actually

run as AM31, and whether it would be possible to

run them as AM64 instead.



That might provide a better route to get the changes

into z/OS.



What's the best place to ask about z/Linux?



Thanks. Paul.











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[[e-mail] [hercules-os380]]

Post by Amrith ***@yahoo.com [hercules-os380]
I don't think there are any cross compilers
available with free z Linux distos. The ones
provided produce ELF.

Sorry, my message was confusing.

I'm not trying to do a cross-compile. What I'm
trying to do is get the concept of 32-bit programs
running as AM64 into z/Linux (if it isn't already
there), and hopefully that will encourage the
same technology to be made available on z/OS.

BFN. Paul.

['Dave Wade' [e-mail] [hercules-os380]]

-----Original Message-----
Sent: 16 May 2018 05:29
Subject: Re: [hercules-os380] AM64 under z/Linux

Post by Amrith ***@yahoo.com [hercules-os380]
I don't think there are any cross compilers available with free z
Linux distos. The ones provided produce ELF.

Sorry, my message was confusing.
I'm not trying to do a cross-compile. What I'm trying to do is get the concept
of 32-bit programs running as AM64 into z/Linux (if it isn't already there), and
hopefully that will encourage the same technology to be made available on
z/OS.

It’s a different world. zLinux does not have to be compatible with any of the old world. It was built to be clean from the ground up. No 24-bit addressing exists.
zOS is the mess it is because you can take any problem state 50 year old MVT program link Fortran-G and run it on todays hardware.

Dave

BFN. Paul.
------------------------------------
------------------------------------
------------------------------------
Yahoo Groups Links

[[e-mail] [hercules-os380]]

Post by 'Dave Wade' ***@gmail.com [hercules-os380]
It’s a different world. zLinux does not have to
be compatible with any of the old world. It was
built to be clean from the ground up. No 24-bit
addressing exists.

But my question is - does 31-bit addressing exist?

Post by 'Dave Wade' ***@gmail.com [hercules-os380]
zOS is the mess it is because you can take any
problem state 50 year old MVT program link
Fortran-G and run it on todays hardware.

Sure. Upgrading to pure AM64 should be
voluntary.

BFN. Paul.

[Tony Harminc [e-mail] [hercules-os380]]

Post by ***@yahoo.com.au [hercules-os380]

Post by 'Dave Wade' ***@gmail.com [hercules-os380]
It’s a different world. zLinux does not have to
be compatible with any of the old world. It was
built to be clean from the ground up. No 24-bit
addressing exists.

But my question is - does 31-bit addressing exist?

Yes, both 24-bit and 31-bit addressing exist in zLinux. How could they not?
The instructions to switch addressing mode are unprivileged, so the Linux
kernel cannot stop a program from using any addressing mode. But whether
the kernel supports interrupts and calls made in all three modes, I have no
idea. Perhaps it's like early z/OS "support" for 64-bit mode where
everything was fine up until the first interrupt.

Tony H.

[[e-mail] [hercules-os380]]

Post by 'Dave Wade' ***@gmail.com [hercules-os380]
zOS is the mess it is because you can take any
problem state 50 year old MVT program link
Fortran-G and run it on todays hardware.

Also, I would argue that ideally even 50 years
ago people should have been writing
AM-anything code, and it is not wrong for a
site to require that issue to be rectified going
forward.

AM32 and AM-infinity should have been obvious
for the long term. Making code conform to this
is what I should have been tasked with circa
1988 instead of putting BSM everywhere.

BFN. Paul.

[Amrith [e-mail] [hercules-os380]]

I remember using Fedora(zLinux) where gcc allowed the m32 option not sure if it produced 32 bit executables. Why would adding 32 bit support on zos be on IBMs priority list?


--------------------------------------------
On Wed, 5/16/18, ***@yahoo.com.au [hercules-os380] <hercules-***@yahoogroups.com> wrote:

Subject: Re: [hercules-os380] AM64 under z/Linux
To: hercules-***@yahoogroups.com
Date: Wednesday, May 16, 2018, 4:28 AM


 

Post by Amrith ***@yahoo.com [hercules-os380]
I don't think there are any cross compilers
available with free z Linux distos. The ones
provided produce ELF.

Sorry, my message was confusing.



I'm not trying to do a cross-compile. What I'm

trying to do is get the concept of 32-bit programs

running as AM64 into z/Linux (if it isn't already

there), and hopefully that will encourage the

same technology to be made available on z/OS.



BFN. Paul.











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[[e-mail] [hercules-os380]]

Post by Amrith ***@yahoo.com [hercules-os380]
Why would adding 32 bit support on zos
be on IBMs priority list?

Because pure 32-bit programs and pure
64-bit programs should be the technical future.

I was going to add that moving DAT tables into
an alternate address space as per Greg Price's
design should be the technical future too, but
I don't think DAT tables are a problem anymore.

BFN. Paul.

[Amrith [e-mail] [hercules-os380]]

Mike
I am a bit confused here. When you say all 64 bit does it mean that all addressing and binary residency in memory are above 2gb?
--------------------------------------------
On Tue, 5/15/18, Mike Schwab ***@gmail.com [hercules-os380] <hercules-***@yahoogroups.com> wrote:

Subject: Re: [hercules-os380] AM64 under z/Linux
To: hercules-***@yahoogroups.com
Date: Tuesday, May 15, 2018, 11:33 PM


 









z/Linux (s390-x) is all 64 bit. No history of
using high order bit.

On S/390 was restricted by hardware to 31 bit. Application
may still

be 32 bit compilers.

Post by ***@yahoo.com.au [hercules-os380]
Is anyone here familiar with z/Linux? I specifically
want to know whether 32-bit programs are actually
run as AM31, and whether it would be possible to
run them as AM64 instead.
That might provide a better route to get the changes
into z/OS.
What's the best place to ask about z/Linux?
Thanks. Paul.
------------------------------------
------------------------------------
------------------------------------
Yahoo Groups Links

--

Mike A Schwab, Springfield IL USA

Where do Forest Rangers go to get away from it all?











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