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Re: [MiNT] Some comments on gcc 4.3.2

To: Vincent Rivière <vincent.riviere@freesbee.fr>
Subject: Re: [MiNT] Some comments on gcc 4.3.2
From: Andreas Schwab <schwab@suse.de>
Date: Mon, 06 Oct 2008 00:10:56 +0200
Cc: mint <mint@fishpool.com>
In-reply-to: <48E91D74.2040408@freesbee.fr> ("Vincent Rivière"'s message of "Sun, 05 Oct 2008 22:03:00 +0200")
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Vincent Rivière <vincent.riviere@freesbee.fr> writes:

> I was thinking that FPU calls were always F-instructions...
> Are the FPU instructions different between 68000+68881, 68030+68881 and
> 68RC040 ?
> What do you mean by special addressing for the 68000 ?

The 68000 does not have the coprocessor interface, and treats every
line-f instruction as illegal instruction.  The 68881 is addressed like
any other mmio device, and the coprocessor protocol has to be
implemented in software (eg. in the line-f exception handler).

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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References:
- [MiNT] Some comments on gcc 4.3.2
  - From: "Miro Kropacek" <miro.kropacek@gmail.com>
- Re: [MiNT] Some comments on gcc 4.3.2
  - From: Vincent Rivière <vincent.riviere@freesbee.fr>
- Re: [MiNT] Some comments on gcc 4.3.2
  - From: "Miro Kropacek" <miro.kropacek@gmail.com>
- Re: [MiNT] Some comments on gcc 4.3.2
  - From: Vincent Rivière <vincent.riviere@freesbee.fr>
- Re: [MiNT] Some comments on gcc 4.3.2
  - From: Alan Hourihane <alanh@fairlite.co.uk>
- Re: [MiNT] Some comments on gcc 4.3.2
  - From: Vincent Rivière <vincent.riviere@freesbee.fr>
- Re: [MiNT] Some comments on gcc 4.3.2
  - From: Frank Naumann <fnaumann@boerde.de>
- Re: [MiNT] Some comments on gcc 4.3.2
  - From: Vincent Rivière <vincent.riviere@freesbee.fr>

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