Re: [Qemu-devel] Changing the content of target cpu registers

[Blue Swirl]

On Tue, Jan 18, 2011 at 9:29 AM, Stefano Bonifazi
<address@hidden> 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.