libtests/malloc04

[Joel Sherrill]

On 5/3/2013 9:32 AM, Sebastian Huber wrote:
> Hello,
>
> the libtests/malloc04 test has this function:
>
> void * sbrk(ptrdiff_t incr)
> {
>     void *p = (void *) -1;
>
>     printf( "sbrk(%td)\n", incr );
>     if ( sbrk_count == -1 ) {
>       p = (void *) (NULL - 2);
>     } else if ( offset + incr < sizeof(Malloc_Heap) ) {
>        p = &Malloc_Heap[ offset ];
>        offset += incr;
>     } else {
>       if ( sbrk_count == 0 )
>         p = (void *) rtems_task_create;
>       sbrk_count++;
>     }
>
>     sbrk_count++;
>     return p;
> }
>
> What is the purpose of the "p = (void *) rtems_task_create;"?  This test fails
> on a BSP with a write protected code space, because malloc() tries to extend
> its space with the area covered by the rtems_test_create() function.
>
If I recall correctly, it was intended to be a valid but non-contiguous 
address
and get rejected by the extend.

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
Support Available                (256) 722-9985