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

[Antonio Ricci <ricciantonio@slacky.it>]

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

--
Antonio
My Mobile Phone: +393286739562
My Public Key: http://tonyr.altervista.org/chiave_pubblica
MSN: ricciantonio@hotmail.it
Skype: tonyr81fg
Linux Member #374272
*********************************************************************
What is the difference between Jurassic Park and Microsoft?
One is an over-rated high tech theme park based on prehistoric 
information and populated mostly by dinosaurs, the other is a Steven 
Spielberg movie.
*********************************************************************
There are only 10 types of people in this world:
those who understand binary, and those who don't.
*********************************************************************

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
> 
> 
> 
>