tz_vmm application in genode

[Stefan Kalkowski]

Hi,

On 11/12/2014 05:22 AM, Abhay Amala wrote:
> Hi
> 
> I am using tz_vmm example on i.mx53 qsb. In tz_vmm application, i can
> manage to transfer integer arguments using general registers (e.g.
> _vm->state()->r0=100) from secure world to guest VM (linux). How can i
> place a string (array of characters) arguments within the registers?
> They can only store value with data type uint32_t. Thanks in advance.

How about casting your character array to an uint32_t pointer? I think
you should start reading about pointer casting in C, e.g. here:

  http://stackoverflow.com/questions/17260527/casting-pointers-in-c

and about char arrays, e.g. here:


http://stackoverflow.com/questions/10186765/char-array-vs-char-pointer-in-c

BTW. if you want to transfer strings with more than 48 characters, you
should think about using shared memory instead of registers, as it won't
fit into one register transfer (assuming 12 general purpose registers
can be used for characters).

Regards
Stefan

> 
> Regards,
> Abhay
> 
> 
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-- 
Stefan Kalkowski
Genode Labs

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