Re: [Qemu-devel] how to get registers value in event of systemcall

[Antonio Ricci]

Hi Paul,
thanks for your answer.
I've tried to have registers value from do interrupt and it seems to 
work. I've some questions for you:
1) Where these values are initialized? I can't find it.
2) Have I to work on each type of do_interrupt (that is do_interrupt, 
do_interrupt_user, etc.) to get register's value in all kind of syscalls?
3) If i want to avoid  the execution of some type of syscall based on 
parameters is it possible in this way?

Thanks for your help

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Antonio
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Paul Brook wrote:
> > > guest operating system at the moment of a system call. In my opinion i've
> > > to work on file target-i386/translate.c in the case of 0x80 in the
> > > function disas_insn(DisasContext *s, target_ulong pc_start). I can't
> > > understand how to get registers value. I've just read documentation about
> > > translation but I'm not able to get these informations.
> > I think you should go to target-i386/translate.c:
> > gen_intermediate_code_internal(CPUState *env,
> >                                                  TranslationBlock *tb,
> >                                                  int search_pc)
> >
> > specifically, in "env" there is "regs" which hold the CPU registers.
>
> No, that won't work. Only a very limited subset of the CPU state is valid 
> during translation. The same block may be executed many times with different 
> inputs.  If you want register values you have to do it at execution time, 
> e.g. in do_interrupt.
>
> Paul