Am 11.08.2010 11:06, schrieb C K Kashyap:
> Let me see if I understand this right -
>
> qemu loads the a.out and begins to interpret the x86 instructions in 
> the a.out and when a system call happens, it makes the call the host 
> system .... is that right?
>


Right. That's the way how linux user mode emulation (for example 
qemu-i386) works.
See linux-user/syscall.c if you want to see more details.

bsd-user and darwin-user are also supported (more or less), but darwin-user
only supports translation of darwin/powerpc to darwin/x86 syscalls.
It won't help you to run a linux a.out on your mac.

>
>
> On Wed, Aug 11, 2010 at 2:12 PM, Stefan Weil <weil@mail.berlios.de 
> <mailto:weil@mail.berlios.de>> wrote:
>
>     Am 11.08.2010 10:31, schrieb C K Kashyap:
>>     Hi,
>>     I've built qemu on my mac osx using this config -
>>     ./configure --prefix=/Users/ckk/local/
>>     --target-list="i386-softmmu x86_64-softmmu" --enable-linux-user
>>
>>     Now, I have a simple a.out built on linux - how can I run it
>>     using qemu on my mac box?
>>
>>     -- 
>>     Regards,
>>     Kashyap
>
>     Hi Kashyap,
>
>     you cannot run it in user mode emulation unless you replace Mac OS
>     by Linux
>     on your mac box. Linux user emulations requires a Linux host.
>
>     If you have a Linux host, you would need
>     --target-list=i386-linux-user.
>
>     You can run your a.out if you run system emulation (e.g.
>     i386-softmmu/qemu)
>     and install Linux there, of course.
>
>     Regards,
>     Stefan
>
>
>
>
> -- 
> Regards,
> Kashyap