Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Real time embedded FreeRTOS mailing list 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem TCP & FAT Training


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.


[ Back to the top ]    [ About FreeRTOS ]    [ Sitemap ]    [ ]

Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.

Free TCP/IP and file system demos for the RTOS

Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists