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FreeRTOS v8.1.0 on 64-Bit Platforms

Posted by pmendham on August 27, 2014

We are building FreeRTOS v8.1.0 for 64-bit Linux using the POSIX simulator. This is almost all fine, the main addition being the inclusion of a definition for portPOINTERSIZETYPE in portmacros.h:

#define portPOINTER_SIZE_TYPE uintptr_t

(If you see something wrong in this, please say!) However, a single warning remains which, to me, looks like a legitimate concern. On line 556 of tasks.c there is an assert:

configASSERT( ( ( ( uint32_t ) pxTopOfStack & ( uint32_t ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );

In order to silence the warning, we have changed this to:

configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0U ) );

Given that the line above this (555) has a documented MISRA exception on it, and carefully makes use of portPOINTERSIZETYPE, why does the assert cast to uint32_t? Is this a problem for anyone else (e.g. on the Windows simulator), or are we doing something differently/wrong?

Whatever the solution on this line, the same needs to be applied to line 563, which is the same assert, but for positive stack growth.



FreeRTOS v8.1.0 on 64-Bit Platforms

Posted by rtel on August 27, 2014

Probably just because the asserts have mostly been used on devices with 32-bit pointers, or where the pointer is less than 32-bits so casting to a uint_32 is fine. There is no deliberate reason why. We can change it if it causes you an issue.


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