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[Qemu-devel] Re: MIPS instruction set configuration

From: Marius Groeger
Subject: [Qemu-devel] Re: MIPS instruction set configuration
Date: Tue, 27 Jun 2006 17:55:13 +0200 (CEST)

On Tue, 27 Jun 2006, Dirk Behme wrote:

Fabrice Bellard wrote:

3. [PATCH] Add special MIPS multiply instructions

Same remark.

These are NEC VR54xx specific extensions to the MIPS instruction set.

They are used if you use GCC's -march=vr5400 option. See


as well.
Can you add some kind of define or dynamic processor definnition in your patch so that we can keep track of the exact instruction set ?

Yes, I will update the patch. Any ideas or proposals from anybody how to do this the best way? Are there already examples from other architectures?

I think a define to be able to completely select/unselect it at compile time combined with possibility for dynamic runtime selection would be the best?

I'm trying to make sense of a compile-time switch -- for the use to select you vr5400 based platform, I can't think of anything else than a new -M option (ie. a new machine definition). So the full set of possible insns must be present and be available depending on the machine (-M ...) at runtime.

Or is it possible to compile qemu for a specific "-M machine"?


Marius Groeger <address@hidden>
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