[hercules-390] V command translation error Clarification

['Joe Reichman' [e-mail] [hercules-390]]

Hi



I recently tried to display my TCB PSATOLD and got a translation error I
assume e.g. V 8B4EB8 by itself default to the home address space but what is
the home address space do I first start CPU XX but what is the home address
space

For that CPU

[Binyamin Dissen [e-mail] [hercules-390]]

On Sat, 11 Feb 2017 19:41:57 -0500 "'Joe Reichman' ***@gmail.com
[hercules-390]" <hercules-***@yahoogroups.com> wrote:

:>I recently tried to display my TCB PSATOLD and got a translation error I
:>assume e.g. V 8B4EB8 by itself default to the home address space but what is
:>the home address space do I first start CPU XX but what is the home address
:>space

Don't know enough Herc, but assuming similar to VM - unless you placed the
machine in a stop when your TCB was in control the odds are that some other
address space will be in control. Also, simple V probably goes to the primary
address space rather than the home address space.

VM has an ASN qualifier to allow the qualification to a specific address
space, i.e.,

D ASN34.5000

would display location X'5000' in address space x'34'. I would presume that
Herc has a similar construct.

['\'Fish\' (David B. Trout)' [e-mail] [hercules-390]]

Binyamin Dissen wrote:

[...]

Post by Binyamin Dissen ***@dissensoftware.com [hercules-390]
VM has an ASN qualifier to allow the qualification to a
specific address space, i.e.,
D ASN34.5000
would display location X'5000' in address space x'34'. I would
presume that Herc has a similar construct.

Unfortunately, Hercules's "v" command only supports specification of Primary, Secondary or Home space translation mode, but unfortunately NOT any ability to specify a specific ASN (Address Space Number):


HHC01603I help v
HHC01603I
HHC01602I Command Description
HHC01602I ---------------- -------------------------------------------------------
HHC01602I v *Display or alter virtual storage
HHC01603I
HHC01603I Format: "v [P|S|H]addr[.len]" or "v [P|S|H]addr[-addr2]" to display
HHC01603I up to 64K of virtual storage, or "v [P|S|H]addr=value" to alter up to
HHC01603I 32 bytes of virtual storage, where 'value' is a string of up to 32
HHC01603I pairs of hex digits. The optional P, S or H address prefix character
HHC01603I forces Primary, Secondary or Home Space address translation mode
HHC01603I instead of using the current PSW mode, which is the default.
HHC01603I

[Joseph Reichman [e-mail] [hercules-390]]

I think V by itself defaults to HOME albeit
There is no way of knowing which home address

I wonder if it depends on specifying a CPU which
Has a PSAAOLD

Post by '\'Fish\' (David B. Trout)' ***@gmail.com [hercules-390]
[...]

Post by Binyamin Dissen ***@dissensoftware.com [hercules-390]
VM has an ASN qualifier to allow the qualification to a
specific address space, i.e.,
D ASN34.5000
would display location X'5000' in address space x'34'. I would
presume that Herc has a similar construct.

HHC01603I help v
HHC01603I
HHC01602I Command Description
HHC01602I ---------------- -------------------------------------------------------
HHC01602I v *Display or alter virtual storage
HHC01603I
HHC01603I Format: "v [P|S|H]addr[.len]" or "v [P|S|H]addr[-addr2]" to display
HHC01603I up to 64K of virtual storage, or "v [P|S|H]addr=value" to alter up to
HHC01603I 32 bytes of virtual storage, where 'value' is a string of up to 32
HHC01603I pairs of hex digits. The optional P, S or H address prefix character
HHC01603I forces Primary, Secondary or Home Space address translation mode
HHC01603I instead of using the current PSW mode, which is the default.
HHC01603I
--
"Fish" (David B. Trout)
Software Development Laboratories
http://www.softdevlabs.com

[Tony Harminc [e-mail] [hercules-390]]

On 12 February 2017 at 04:28, ''Fish' (David B. Trout)'

Post by '\'Fish\' (David B. Trout)' ***@gmail.com [hercules-390]
HHC01603I help v
HHC01603I
HHC01602I Command Description
HHC01602I ---------------- -------------------------------------------------------
HHC01602I v *Display or alter virtual storage
HHC01603I
HHC01603I Format: "v [P|S|H]addr[.len]" or "v [P|S|H]addr[-addr2]" to display
HHC01603I up to 64K of virtual storage, or "v [P|S|H]addr=value" to alter up to
HHC01603I 32 bytes of virtual storage, where 'value' is a string of up to 32
HHC01603I pairs of hex digits. The optional P, S or H address prefix character
HHC01603I forces Primary, Secondary or Home Space address translation mode
HHC01603I instead of using the current PSW mode, which is the default.

So if the default is the current PSW mode, what does it do if that
mode is AR? How does it choose an access register to use?

Tony H.

[Joseph Reichman [e-mail] [hercules-390]]

I haven't tried this

But me thinks it looks the corrent CPU set with the CPU command and each CPU had is own PSA
And it's own PSAAOLD

Post by Tony Harminc ***@gmail.com [hercules-390]
On 12 February 2017 at 04:28, ''Fish' (David B. Trout)'

Post by '\'Fish\' (David B. Trout)' ***@gmail.com [hercules-390]
HHC01603I help v
HHC01603I
HHC01602I Command Description
HHC01602I ---------------- -------------------------------------------------------
HHC01602I v *Display or alter virtual storage
HHC01603I
HHC01603I Format: "v [P|S|H]addr[.len]" or "v [P|S|H]addr[-addr2]" to display
HHC01603I up to 64K of virtual storage, or "v [P|S|H]addr=value" to alter up to
HHC01603I 32 bytes of virtual storage, where 'value' is a string of up to 32
HHC01603I pairs of hex digits. The optional P, S or H address prefix character
HHC01603I forces Primary, Secondary or Home Space address translation mode
HHC01603I instead of using the current PSW mode, which is the default.

So if the default is the current PSW mode, what does it do if that
mode is AR? How does it choose an access register to use?
Tony H.

[Ivan Warren [e-mail] [hercules-390]]

I haven't tried this > > But me thinks it looks the corrent CPU

set with the CPU command and > each CPU had is own PSA And it's own
PSAAOLD >
I don't think that was the question.

The question is that if you have a PSW with AR mode enabled, how do you
specify which Access Register to use for translation ? An instruction
would use the same AR as the base register. For example : in AR mode, "L
1,0(2)" will use GPR2 to construct the logical address, and then use AR2
for translation.

I think the question is : when using the "v" panel command, how does one
specify which AR to use when the PSW is in AR mode ?

--Ivan


[Non-text portions of this message have been removed]

[Joseph Reichman [e-mail] [hercules-390]]

I think if you don't specify anything it's AR0

A value of zero is home

In AR mode instead of a valid alert a value 0 is home 1 primary 2 secondary


I think that's what the code does v with out anything in AR mode is a AR of 0

Post by Ivan Warren ***@vmfacility.fr [hercules-390]

I haven't tried this > > But me thinks it looks the corrent CPU

set with the CPU command and > each CPU had is own PSA And it's own
PSAAOLD >
I don't think that was the question.
The question is that if you have a PSW with AR mode enabled, how do you
specify which Access Register to use for translation ? An instruction
would use the same AR as the base register. For example : in AR mode, "L
1,0(2)" will use GPR2 to construct the logical address, and then use AR2
for translation.
I think the question is : when using the "v" panel command, how does one
specify which AR to use when the PSW is in AR mode ?
--Ivan
[Non-text portions of this message have been removed]

[Binyamin Dissen [e-mail] [hercules-390]]

On Sun, 12 Feb 2017 20:50:05 -0500 "Joseph Reichman ***@gmail.com
[hercules-390]" <hercules-***@yahoogroups.com> wrote:

:>I think if you don't specify anything it's AR0

:>A value of zero is home

No, a value of zero is primary.

:>In AR mode instead of a valid alert a value 0 is home 1 primary 2 secondary

Alet 0 = primry, Alet 1 = secondary (hardware), Alet 2 = home (DUAL)

:>I think that's what the code does v with out anything in AR mode is a AR of 0
:>
:>> On Feb 12, 2017, at 8:06 PM, Ivan Warren ***@vmfacility.fr [hercules-390] <hercules-***@yahoogroups.com> wrote:
:>>
:>>
:>>
:>> On 2/13/2017 1:44 AM, Joseph Reichman ***@gmail.com
:>> [hercules-390] wrote:
:>> > > > I haven't tried this > > But me thinks it looks the corrent CPU
:>> set with the CPU command and > each CPU had is own PSA And it's own
:>> PSAAOLD >
:>> I don't think that was the question.
:>>
:>> The question is that if you have a PSW with AR mode enabled, how do you
:>> specify which Access Register to use for translation ? An instruction
:>> would use the same AR as the base register. For example : in AR mode, "L
:>> 1,0(2)" will use GPR2 to construct the logical address, and then use AR2
:>> for translation.
:>>
:>> I think the question is : when using the "v" panel command, how does one
:>> specify which AR to use when the PSW is in AR mode ?
:>>
:>> --Ivan
:>>
:>> [Non-text portions of this message have been removed]
:>>
:>>

[Ivan Warren [e-mail] [hercules-390]]

Post by Binyamin Dissen ***@dissensoftware.com [hercules-390]
:>I think if you don't specify anything it's AR0
:>A value of zero is home
No, a value of zero is primary.
:>In AR mode instead of a valid alert a value 0 is home 1 primary 2 secondary
Alet 0 = primry, Alet 1 = secondary (hardware), Alet 2 = home (DUAL)

When DAT is on, the address space is controlled by bits 16 and 17 of the
PSW :

- 00 : Primary
- 01 : Access Register Mode
- 10 : Secondary
- 11 : Home

AR-Specified Virtual Address
An AR-specified virtual address is a virtual address
which is to be translated by means of an access-register-
specified address-space-control element. Logical
addresses are treated as AR-specified addresses
when in the access-register mode.

--Ivan



[Non-text portions of this message have been removed]

[Tony Harminc [e-mail] [hercules-390]]

Post by Binyamin Dissen ***@dissensoftware.com [hercules-390]
Alet 0 = primry, Alet 1 = secondary (hardware), Alet 2 = home (DUAL)

Right. Just to emphasise your point, the magic ALET values 0 and 1 are
hardware-defined, but the value 2 is implemented entirely in software
by z/OS, and works exactly like any other ALET value. Other operating
systems may or may not implement this shortcut.

Back to the issue of the Hercules V command, there is no answer but to
look at the code. Clearly there is room for improvement/enhancement.

Tony H.

[Jon Perryman [e-mail] [hercules-390]]

The op needs to give some information. I think the op has a very basic problem and AR mode is not part of their skill set. AR mode is confusing even if you have some AR experience. E.g. AR's being confused with alet's. AR's are associated to each register. AR0 is always assumed to be ALET 0. The V command does not reference AR's (only the first 3 ALET's). 
The op mentioned "starting a CPU" and their TCB. The CPU must be stopped otherwise it will be a changing target. Second, we have no clue how they found this TCB.

You can use use STARTALL and STOPALL until you find your TCB active on a CPU (or use breakpoint).Use the CPU xx command to select that CPU. If you are not in an AR mode, then the V command should work.

Alternatively, you could set an MVS PER SLIP ACTION=WAIT to stop the system when the condition is met. Find the CPU with your TCB. Use CPU xx and then the V command.
Good luck.

Post by Binyamin Dissen ***@dissensoftware.com [hercules-390]
Alet 0 = primry, Alet 1 = secondary (hardware), Alet 2 = home (DUAL)

Right. Just to emphasise your point, the magic ALET values 0 and 1 are
hardware-defined, but the value 2 is implemented entirely in software
by z/OS, and works exactly like any other ALET value. Other operating
systems may or may not implement this shortcut.

Back to the issue of the Hercules V command, there is no answer but to
look at the code. Clearly there is room for improvement/enhancement.

Tony H.
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[Joseph Reichman [e-mail] [hercules-390]]

Tony thanks I now understand

The problem "The CPU must me stopped"

Or else the target changes I got it

I understand why it's not working

Post by Jon Perryman ***@pacbell.net [hercules-390]
The op needs to give some information. I think the op has a very basic problem and AR mode is not part of their skill set. AR mode is confusing even if you have some AR experience. E.g. AR's being confused with alet's. AR's are associated to each register. AR0 is always assumed to be ALET 0. The V command does not reference AR's (only the first 3 ALET's).
The op mentioned "starting a CPU" and their TCB. The CPU must be stopped otherwise it will be a changing target. Second, we have no clue how they found this TCB.
You can use use STARTALL and STOPALL until you find your TCB active on a CPU (or use breakpoint).Use the CPU xx command to select that CPU. If you are not in an AR mode, then the V command should work.
Alternatively, you could set an MVS PER SLIP ACTION=WAIT to stop the system when the condition is met. Find the CPU with your TCB. Use CPU xx and then the V command.
Good luck.

Post by Binyamin Dissen ***@dissensoftware.com [hercules-390]
Alet 0 = primry, Alet 1 = secondary (hardware), Alet 2 = home (DUAL)

Right. Just to emphasise your point, the magic ALET values 0 and 1 are
hardware-defined, but the value 2 is implemented entirely in software
by z/OS, and works exactly like any other ALET value. Other operating
systems may or may not implement this shortcut.
Back to the issue of the Hercules V command, there is no answer but to
look at the code. Clearly there is room for improvement/enhancement.
Tony H.

[Tony Harminc [e-mail] [hercules-390]]

Post by Jon Perryman ***@pacbell.net [hercules-390]
I think the op has a very basic problem and AR mode is not part of their skill set. AR
mode is confusing even if you have some AR experience.

That may well be true, but you are not exactly clarifying things.

Post by Jon Perryman ***@pacbell.net [hercules-390]
E.g. AR's being confused with alet's. AR's are associated to each
register. AR0 is always assumed to be ALET 0.
The V command does not reference AR's (only the first 3 ALET's).

Well, it's not entirely clear what it does from the help, which is why

Post by Jon Perryman ***@pacbell.net [hercules-390]

Post by '\'Fish\' (David B. Trout)' ***@gmail.com [hercules-390]
HHC01603I Format: "v [P|S|H]addr[.len]" or "v [P|S|H]addr[-addr2]" to display
HHC01603I up to 64K of virtual storage, or "v [P|S|H]addr=value" to alter up to
HHC01603I 32 bytes of virtual storage, where 'value' is a string of up to 32
HHC01603I pairs of hex digits. The optional P, S or H address prefix character
HHC01603I forces Primary, Secondary or Home Space address translation mode
HHC01603I instead of using the current PSW mode, which is the default.

So if the default is the current PSW mode, what does it do if that
mode is AR? How does it choose an access register to use?

It's also not the case that it "references the first 3 ALETs". What it
says it does (though the help is clearly incomplete and perhaps also
wrong) is use the translation mode selected by the command issuer, or
the default of the current PSW's translation mode. Of those
translation modes, only AR mode requires an ALET, and that's where we
came in.

Tony H.