Re: [Qemu-devel] Moniter The Ram Access On QEMU

[stefan weids <stefanweids@gmail.com>]

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Hi Wei-Ren,

Thanks for your reply.

According your email, the function "do_interrupt" handle the external
interrupt just like keyboard interrupt, and the function "gen_exception"
handle the exception just like “SWI”.etc. So the function “gen_exception”
seems to be the answer.

Any comments are appreciated.

BR,
Stefan




在 2012年3月29日 下午7:07，陳韋任 <chenwj@iis.sinica.edu.tw>写道：

> > Now I have some probem with the exception handle. I found the funciton
> > "do_interrupt" in "target-arm/helper.c" and "gen_exception" in
> > "target-arm/translate.c" seems to handle the exceptions. But I am
> comfused
> > with those two functions, which function will do the really work about
> > generating an exception. As my understanding, I think “do_interrupt”
> seems
> > to do some preparations before enter exceptions just like operate some
> > registers and accumulate the exception handler address. And
> "gen_exception"
> > seems to do the read job to generate a exception. But I'm not sure.
>
>   Interrupt is a "external" source which breaks the current execution flow
> of
> the CPU. For example, a device might raise an interrupt so that CPU can
> know the
> device has completed its task. On the other hand, exception is an
> "internal"
> source which breaks the current execution flow of the CPU. Take divide by
> zero
> as an example, CPU will detect this error (occurred in the CPU itself). So
> depends on what you mean "exception", do_interrupt or gen_exception might
> does
> the real work.
>
> Regards,
> chenwj
>
> --
> Wei-Ren Chen (陳韋任)
> Computer Systems Lab, Institute of Information Science,
> Academia Sinica, Taiwan (R.O.C.)
> Tel:886-2-2788-3799 #1667
> Homepage: http://people.cs.nctu.edu.tw/~chenwj
>

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