Re: [Qemu-devel] Question about memory micro operations in Qemu 0.12.x

[Alexander]

Thank you for your answer.

I still have some questions.

27.03.2010 12:49, Stuart Brady пишет:
> On Fri, Mar 26, 2010 at 11:23:30PM +0300, address@hidden wrote:
>    
> > Hello.
> > in qemu 0.9.x there was a special file with micro-operations, which
> > implemented access to memory. For example for arm architecture it
> > was op_mem.h file. I was able to add some printfs to this functions
> > and get information about memory accesses.
> >
> > My question is : how memory access microoperations are now
> > implemented in qemu 0.12.x ?
> >
> > Thanks for you answers.
> >      
> To generate load and store operations, tcg_gen_qemu_{ld,st}*() are now
> used.  See tcg/README for more information on TCG ops.
>
> In tcg/*/tcg-target.c, you'll find tcg_out_qemu_{ld,st}().  The easiest
> way to do this would probably be to place your printfs in __ld_mmu() and
> __st_mmu() (which are defined via softmmu_template.h), and remove the
> TLB lookups from tcg_out_qemu_{ld,st}() so that your tracing code is
> always called.
>    

1. How can I remove TLB lookups from tcg_out_qemu_{ld,st} ?

> Instead of modifying tcg_out_qemu_{ld,st}(), you might also be able to
> bypass it entirely, by using having tcg_gen_qemu_{ld,st}*() generate
> calls to a helper function.
>    
2. Can you give me some examples of it ?
> Cheers,
>    

Thanks for your help.