From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Lauro Ramos Venancio <lauro.venancio@indt.org.br>
Subject: Re: [Qemu-devel] qemu-arm: wrong execution of post-indexed loads when Rm and Rd are the same register
Date: Thu, 15 Mar 2007 20:03:20 +0000 [thread overview]
Message-ID: <200703152003.21276.paul@codesourcery.com> (raw)
In-Reply-To: <1173987324.9939.0.camel@edgy-laptop>
On Thursday 15 March 2007 19:35, Lauro Ramos Venancio wrote:
> Qemu-arm is wrongly executing post-indexed loads when Rm and Rd are
> the same register. For example:
>
> ldr r0, [r1], +r0
>
> Current behavior:
> r0 <- [r1]
> r1 <- r1 + r0
>
> Expected behavior:
> addr <- r1
> r1 <- r1 + r0
> r0 <- [addr]
This is still wrong. The writeback must happen after the load. Your
implementation will give incorrect results if the load faults.
Paul
next prev parent reply other threads:[~2007-03-15 20:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-15 19:35 [Qemu-devel] qemu-arm: wrong execution of post-indexed loads when Rm and Rd are the same register Lauro Ramos Venancio
2007-03-15 19:43 ` [Qemu-devel] " Lauro Ramos Venancio
2007-03-15 20:03 ` Paul Brook [this message]
2007-03-15 20:32 ` [Qemu-devel] " Rodrigo Vivi
2007-03-15 21:10 ` Paul Brook
2007-03-15 21:19 ` Rodrigo Vivi
2007-03-15 21:55 ` Laurent Desnogues
2007-03-15 22:04 ` Paul Brook
2007-03-16 20:42 ` Lauro Ramos Venancio
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