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Re: [Qemu-devel] log every write to register


From: Peter Maydell
Subject: Re: [Qemu-devel] log every write to register
Date: Tue, 3 Nov 2015 16:14:00 +0000

On 3 November 2015 at 13:17, Sergey Smolov <address@hidden> wrote:
> I have a collection of ARMv8 register names. I need to add special logging
> mode to QEMU so that every time it is enabled, every write access to any of
> the specified registers will produce a new record to log, including register
> name and a value to be written.
>
> Is it possible to accomplish such a task? If yes, where shall I find
> functions that implement "writing to register" functionality?

This is difficult, because we don't have a single convenient
location which all register accesses go through. (General purpose
registers and some system registers will be optimised so that
accesses are made directly from JIT generated code.)

thanks
-- PMM



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