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Groups > comp.sys.acorn.programmer > #1690

Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi)

From Martin Wuerthner <spamtrap@mw-software.com>
Newsgroups comp.sys.acorn.programmer
Subject Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi)
Date 2012-05-04 11:55 +0200
Organization MW Software
Message-ID <4be2868a52.martin@bach.planiverse.com> (permalink)
References (1 earlier) <8c9ee056-ccb0-4681-a4ce-3ce728229227@a5g2000vbl.googlegroups.com> <almarsoft.1298447559957852518@news.orange.fr> <4aa58fef-37c8-4855-b82a-b99849e6c4b6@l18g2000vbx.googlegroups.com> <almarsoft.5791856520908937242@news.orange.fr> <almarsoft.5638329217787058523@news.orange.fr>

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In message <almarsoft.5638329217787058523@news.orange.fr>
          Rick Murray <heyrickmail-usenet@yahoo.co.uk> wrote:

> On Wed, 02 May 2012 19:26:23 +0200, Rick Murray
> <heyrickmail-usenet@yahoo.co.uk> wrote:

>> Indeed, my suggestion was to trap aborts

> To follow up on my reply, having waded through both ARM ARMs and
> countless PDFs, is that there are two approaches to this problem.

> 1. The logical (Gerph) approach
> This is to wait for the MMU to raise a Data Abort and then patch it
> up. I suspect reality is somewhat more complicated given that the
> current RISC OS has an option to control alignment exceptions - why
> would that be necessary if the OS could provide support for unaligned
> accesses?

This pragmatic approach is necessary because the OS *does not* provide 
support for unaligned accesses. It does not necessarily mean that the 
OS *could not* provide it. If anyone had done the work to add the 
required exception handling, there would be no need to allow users to 
turn the exception off.

-- 
Martin
---------------------------------------------------------------------
Martin Wuerthner         MW Software      http://www.mw-software.com/
        RISC OS Software for Design, Printing and Publishing
---------------------------------------------------------------------

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Thread

ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Chris Evans <chris@cjemicros.co.uk> - 2012-04-19 13:05 +0100
  Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Bazley <martin.bazley@blueyonder.co.uk> - 2012-04-19 14:15 +0100
    Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Chris Evans <chris@cjemicros.co.uk> - 2012-04-19 16:10 +0100
      Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-04-19 18:41 +0200
      Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-19 19:46 +0100
        Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Wuerthner <spamtrap@mw-software.com> - 2012-04-19 21:24 +0200
  Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-04-19 18:32 +0200
  Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) chrisbazley@bigfoot.com - 2012-04-29 06:37 -0700
    Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Bazley <martin.bazley@blueyonder.co.uk> - 2012-04-29 15:47 +0100
    Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gerph <gerph@gerph.org> - 2012-04-29 07:39 -0700
    Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) druck <news@druck.org.uk> - 2012-04-29 19:30 +0100
    Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-04-30 06:16 +0200
      Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) druck <news@druck.org.uk> - 2012-04-30 22:47 +0100
      Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gerph <gerph@gerph.org> - 2012-04-30 15:30 -0700
        Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-02 19:26 +0200
          Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gavin Wraith <gavin@wra1th.plus.com> - 2012-05-02 21:02 +0100
          Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) druck <news@druck.org.uk> - 2012-05-02 22:33 +0100
            Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) cferris@freeRemoveuk.com.invalid - 2012-05-02 23:37 +0100
              Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-03 06:25 +0200
              Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) trevj <trevj@cwazy.co.uk> - 2012-05-03 13:01 -0700
          Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-04 06:30 +0200
            Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Wuerthner <spamtrap@mw-software.com> - 2012-05-04 11:55 +0200
              Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-05-04 22:39 +0100
            Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-05 17:58 +0200
              Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-05-05 17:22 +0100
        Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Simon <simon.willcocks@t-online.de> - 2012-05-04 04:24 -0700
      Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-05-01 21:33 +0100
        Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gerph <gerph@gerph.org> - 2012-05-01 17:06 -0700
        Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-02 19:02 +0200

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