From: Paul Brook <paul@codesourcery.com>
To: Aurelien Jarno <aurelien@aurel32.net>
Cc: Peter Maydell <peter.maydell@linaro.org>,
qemu-devel@nongnu.org, patches@linaro.org
Subject: Re: [Qemu-devel] [PATCH] target-arm: Minimal implementation of performance counters
Date: Mon, 16 May 2011 17:10:58 +0100 [thread overview]
Message-ID: <201105161710.59650.paul@codesourcery.com> (raw)
In-Reply-To: <20110514213247.GB13600@volta.aurel32.net>
> > I just spoke with Paul on IRC about this. In summary:
> > * for a helper to cause an exception then it has (a) to make sure CPU
> >
> > state (pc, condflags) is sync'd before the call to the helper and (b)
> > the helper has to be in a file with access to global env, because it
> > needs to call cpu_loop_exit()
>
> I don't think (a) is true. It is possible to use the same way as for
> load/store operations, that is call cpu_restore_state() before calling
> cpu_loop_exit().
To call cpu_restore_state you need to know searched_pc. To find that you need
to unwind the host stack all the way back to translated code.
Paul
next prev parent reply other threads:[~2011-05-16 16:11 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-21 16:01 [Qemu-devel] [PATCH] target-arm: Minimal implementation of performance counters Peter Maydell
2011-04-22 7:23 ` Brad Hards
2011-04-22 9:48 ` Peter Maydell
2011-04-22 10:32 ` Brad Hards
2011-04-25 21:09 ` Aurelien Jarno
2011-04-25 21:59 ` Peter Maydell
2011-04-25 22:31 ` Aurelien Jarno
2011-04-25 22:35 ` Peter Maydell
2011-04-26 10:23 ` Aurelien Jarno
2011-05-06 14:32 ` Peter Maydell
2011-05-14 21:32 ` Aurelien Jarno
2011-05-14 22:01 ` Blue Swirl
2011-05-14 22:10 ` Aurelien Jarno
2011-05-16 9:59 ` Peter Maydell
2011-05-16 17:29 ` Aurelien Jarno
2011-05-16 17:51 ` Peter Maydell
2011-06-15 17:39 ` Peter Maydell
2011-05-16 16:10 ` Paul Brook [this message]
2011-05-16 16:37 ` Peter Maydell
2011-05-16 17:29 ` Aurelien Jarno
2011-05-16 17:47 ` Peter Maydell
2011-05-16 18:06 ` Aurelien Jarno
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