Thanks Martin,
I have one more doubt regarding reading the general purpose register in
Genode.
I want to read the General purpose register value. Can you give me some
clue on this
Regards,
Franc
On Thu, Apr 16, 2015 at 5:13 PM, Martin Stein <martin.st...@genode-labs.com>
wrote:
> Hi Franc,
>
> On 16.04.2015 12:01, Franc sylvester wrote:
> > I used this explanation to write a system call but i am not able to get
> > user argument value inside the system call.
> > Can you provide some more information to get argument value inside the
> > system call.
>
> As you can see in the other system calls in [1] it should be sufficient
> in the userland to do:
>
> ret = call(call_id_<NAME>(), (Call_arg)arg_0, (Call_arg)arg_1, ...);
>
> This method can mangle up to 6 arguments into the appropriate registers
> (on ARM registers R0...R5, for details see [2]). In the kernel, you can
> then read these arguments by calling the following methods on the
> Kernel::Thread object of the user:
>
> arg_0 = user_arg_0();
> arg_1 = user_arg_1();
> ...
>
> To pass a return value to the user, call the following on the users
> Kernel::Thread object:
>
> user_arg_0(ret);
>
> The return value is then returned by the initially mentioned function in
> the userland.
>
> Cheers,
> Martin
>
> [1] base-hw/include/kernel/interface.h
> [2] base-hw/src/base/arm/kernel/interface.cc
>
>
>
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