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From: John McCabe <john@nospam.mccabe.org.uk>
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Subject: Re: Are there any cross-compiler for Embedded Linux on ARMv7?
Date: Wed, 7 Apr 2021 09:00:11 -0000 (UTC)
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On Tue, 06 Apr 2021 21:19:32 +0000, antispam wrote:

> Shark8 <onewingedshark@gmail.com> wrote:

<..snip..>

>> IIRC the ARM-9 was Jazelle that did the most "Java bytecode as native
>> instructions", and there was a GNAT-JVM (IIRC GNAT Community release
>> circa 2014) that targeted the JVM, which was Ada 2005 and [slightly
>> buggy, iIRC] Ada 2012 ? hence it could be possible to run JVM-targeted
>> Ada 2005/2012 natively on such a processor.

> Is there real hardware implementing Java bytecode?  My impression was
> that the whole thing was mostly software.  It is not clear to me if it
> has any advantages compared to different JVM.  IIUC there is clear
> disadvantage: Jazelle need software support integrated at low level with
> OS.  It is not clear to me if ARM Linux has needed support.

There is a description of it on Wikipedia, at https://en.wikipedia.org/
wiki/Jazelle. It sounds like there was a hardware layer that translated 
bytecode into machine instructions as a stage in the instruction pipeline.

It doesn't come across as anything to do with ARM Linux though; more 
likely the bare-metal side.