On 2013-08-28 02:00, Hesham Moustafa wrote:
Hey all,
I want to allocate memory within an application code, set
memory access attributes on it, and check whether these
permissions are set correctly or not.
I tried to use _Workspace_Allocate(), malloc(), and partition and region
managers to allocate a region of memory, but just after I set the
allocated region to READ_ONLY attribute, an exception occurs. There is
no problem when I set WRITE attribute. Also when I use hard-coded
addresses ( that do not belong to any used section by RTEMS), I get it
working correctly.
Why do you get an exception? The heap manager places some administration data
right at the begin and end of an allocated block. See also
http://www.rtems.org/onlinedocs/doxygen/cpukit/html/group__RBHeap.html
Is there a way to allocate memory without hard-coded addresses
(target-independent), or the previous "exception-after-set" problem ?
Regards,
Hesham
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