From: cross@spitfire.i.gajendra.net

In article <10du7p7$38rht$1@dont-email.me>,
Arne Vajhøj   wrote:
>On 10/29/2025 7:16 PM, Chris Townley wrote:
>> On 29/10/2025 23:03, Arne Vajhøj wrote:
>>> On 10/29/2025 11:19 AM, Chris Townley wrote:
>>>> On 29/10/2025 14:48, gcalliet wrote:
>>>>> We have got VMS/XDE (https://products.vmssoftware.com/vms-xde-beta).
>>>>> You can develop VMS application on GNU/Linux.
>>>
>>>> I am interested, if only to see how it works, so will give the beta a
>>>> try. Shame it doesn't support aarch64 - I did think of running it on
>>>> a modern Pi!
>>>
>>> I think given the architecture that would require VMS ARM64, which
>>> does not exist. Yet.
>>
>> Yep I realised that, but misread the first bit of PR - mea culpa
>
>That PR text is rather information free.
>
>But Aleksandr has explained a little about how it works.

I wonder how they implement system calls.

I imagine this is mostly done with shared libraries; those bits
that require access to the privileged instruction set are just
"normal" functions that set a bit somewhere and do a jump, as
opposed to a "SYSCALL" instruction or similar.  For VMS this is
actually reasonable, but I'm mildly surprised that they haven't
done something like Dune or gVisor.

	- Dan C.

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