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Re: [PATCH ARM]: Architectural Extensions (Matthew Gretton-Dann or Richard Earnshaw)

On 18/12/12 15:30, David Fernandez wrote:
Hi Richard,

Great, thanks for the info. That will keep me going. I'll look into
.inst, as I was using just a .word to define it for now.

Just as a comment to the whole thing, AFAIK both Cortex-Rn and
Cortex-An have in essence the same architecture, i.e. same instruction
set, same possible extensions, etc. The difference is that while
extensions like virt and sec are standard in Cortex-An, they are
optional in Cortex-Rn.

So I would suggest, that both armv7-r and arm-v7a should have access
to the same extensions, just that armv7-r will have most disabled by
default, while armv7-a would have some enabled by default.

Also, the banked registers instructions are not part of any extension,
and should be present all time. It is a bit weird that you don't have
them unless you enable the virt extension.

I'm not sure I understand what else you think is missing.

The file

	.arch armv7-r
	.syntax unified
	srsia	sp!, #4
	rfefd	sp!

assembles without error for me.

Perhaps you can provide a test-case.


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