[haiku-development] Re: [rfc] OS.h Architecture zoo
- From: François Revol <revol@xxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 22 Jan 2014 16:44:49 +0100
On 22/01/2014 16:38, Jonathan Schleifer wrote:
> Am 22.01.2014 um 16:32 schrieb François Revol <revol@xxxxxxx>:
>
>> Now, I'm not sure about ARM though but I think we can probably hide most
>> of the tweaks in system libs.
>
> Well, for ARM, a vendor does not make that much sense, but we do need some
> extra defines for it.
> E.g. ARMv5 can’t handle Thumb, but there are Thumb versions of ARMv5.
> And that even is a problem if we don’t use Thumb:
> Code that should be able to work together with Thumb code needs to be
Thumb aware,
> e.g. need bx instead of b. But bx only exists on CPUs with Thumb. Or
ARMv6 can’t
> handle movw/movt and many other new instructions of ARMv7. If you
target ARMv7,
> movw and movt are used all over the place.
>
>> As for m68k, we might also want to add ColdFire as it's a bit different,
>> and if I ever get the time I'll make a port to the FireBee ;-)
>
> Isn’t ColdFire the same in the unprivileged mode, but different in privileged
> mode?
AFAIK they removed a lot of opcodes even for user mode...
François.
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