From: Stefano Bonifazi <stefboombastic@gmail.com>
To: Blue Swirl <blauwirbel@gmail.com>
Cc: QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] Changing the content of target cpu registers
Date: Tue, 18 Jan 2011 19:13:35 +0100 [thread overview]
Message-ID: <4D35D84F.5070501@gmail.com> (raw)
In-Reply-To: <AANLkTim9ZLDEQscwcO4hswzz4nJbP-KLnYJ_cU-MYNEw@mail.gmail.com>
On 01/18/2011 06:17 PM, Blue Swirl wrote:
> On Tue, Jan 18, 2011 at 9:29 AM, Stefano Bonifazi
> <stefboombastic@gmail.com> wrote:
>> Hi all!
>> I am working on qemu-user (qemu-ppc).
>> I'd like to edit the values of target registers during the execution. Can I
>> do that by simply changing the content of env->gpr[] or do these only
>> contain a copy of the values of the registers?
>> In this last case, where are the real values of the target registers stored
>> so that by modifying them I can alter the behavior of the target code
>> execution?
> env->gpr is the canonical location, but the translator assigns TCG
> variables to them (cpu_gpr[] in translate.c), so GPR contents may be
> cached to these. But when helpers are called or the TB finishes,
> env->gpr should be valid again.
Hi!
Thank you for your answer!
So if I understand well if I set env->gpr in a code section where there
is no TCG translation on progress, I can edit directly the target CPU
register right?
Best Regards!
Stefano B.
next prev parent reply other threads:[~2011-01-18 18:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-18 9:29 [Qemu-devel] Changing the content of target cpu registers Stefano Bonifazi
2011-01-18 17:17 ` Blue Swirl
2011-01-18 18:13 ` Stefano Bonifazi [this message]
2011-01-21 22:41 ` Raphaël Lefèvre
2011-01-22 19:35 ` Blue Swirl
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