[Qemu-devel] HELP PLEASE! Consecutive runs of qemu-user

[Qemu-devel] HELP PLEASE! Consecutive runs of qemu-user

[Stefano Bonifazi]

Hi!
  First of all Happy new year to everybody! :) Wish you all to realize 
all your dreams! :)
I edited QEMU user, more exactly qemu-ppc launching the main function 
(inside main.c) from another c function I created, passing it the 
appropriate parameters.
I also caught the syscall 1 preventing it to abort the process, and 
simply returning from cpu_loop function, so that this function is not 
more endless, and main returns to my user defined function.
The problem is that launching a second time main with other parameters 
fails: leaving the code like it was, the previous translated binary was 
kept "in memory" and run again, no matter what binary parameter I passed 
to main.
I added then tb_flush(env); after cpu_loop inside main..
But with this edit launching main with other parameters blocks the 
execution at tcg_qemu_tb_exec(tc_ptr); ..It sounds like QEMU stores the 
state of the translation even after main function is over :(
Is it possible to reset completely the state, allowing consecutive runs 
of different binaries?
What are the state variables I should "clean" between different runs?
Thank you very much for your help!
Best regards!
Stefano B.

Re: [Qemu-devel] HELP PLEASE! Consecutive runs of qemu-user

[Stefan Weil]

Am 01.01.2011 22:31, schrieb Stefano Bonifazi:
> Hi!
>  First of all Happy new year to everybody! :) Wish you all to realize 
> all your dreams! :)
> I edited QEMU user, more exactly qemu-ppc launching the main function 
> (inside main.c) from another c function I created, passing it the 
> appropriate parameters.
> I also caught the syscall 1 preventing it to abort the process, and 
> simply returning from cpu_loop function, so that this function is not 
> more endless, and main returns to my user defined function.
> The problem is that launching a second time main with other parameters 
> fails: leaving the code like it was, the previous translated binary 
> was kept "in memory" and run again, no matter what binary parameter I 
> passed to main.
> I added then tb_flush(env); after cpu_loop inside main..
> But with this edit launching main with other parameters blocks the 
> execution at tcg_qemu_tb_exec(tc_ptr); ..It sounds like QEMU stores 
> the state of the translation even after main function is over :(
> Is it possible to reset completely the state, allowing consecutive 
> runs of different binaries?
> What are the state variables I should "clean" between different runs?
> Thank you very much for your help!
> Best regards!
> Stefano B.

Hi Stefano,

maybe 'qemu -singlestep' helps.

Regards,
Stefan W.