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Allow auto switching between creating tasks in ARM mode and THUMB mode.

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This commit is contained in:
Richard Barry 2009-09-29 20:03:55 +00:00
parent afaa3321ba
commit ad441634f0
1 changed files with 18 additions and 10 deletions
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28
Source/portable/IAR/STR71x/port.c
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@ -3,14 +3,14 @@
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation and modified by the FreeRTOS exception.
**NOTE** The exception to the GPL is included to allow you to distribute a
combined work that includes FreeRTOS without being obliged to provide the
source code for proprietary components outside of the FreeRTOS kernel.
Alternative commercial license and support terms are also available upon
request. See the licensing section of http://www.FreeRTOS.org for full
combined work that includes FreeRTOS without being obliged to provide the
source code for proprietary components outside of the FreeRTOS kernel.
Alternative commercial license and support terms are also available upon
request. See the licensing section of http://www.FreeRTOS.org for full
license details.
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
@ -46,7 +46,7 @@
*/
/*-----------------------------------------------------------
* Implementation of functions defined in portable.h for the ST STR71x ARM7
* Implementation of functions defined in portable.h for the ST STR71x ARM7
* port.
*----------------------------------------------------------*/
@ -62,7 +62,8 @@
#include "task.h"
/* Constants required to setup the initial stack. */
#define portINITIAL_SPSR ( ( portSTACK_TYPE ) 0x3f ) /* System mode, THUMB mode, interrupts enabled. */
#define portINITIAL_SPSR ( ( portSTACK_TYPE ) 0x1f ) /* System mode, ARM mode, interrupts enabled. */
#define portTHUMB_MODE_BIT ( ( portSTACK_TYPE ) 0x20 )
#define portINSTRUCTION_SIZE ( ( portSTACK_TYPE ) 4 )
/* Constants required to handle critical sections. */
@ -80,7 +81,7 @@ cannot be initialised to 0 as this will cause interrupts to be enabled
during the kernel initialisation process. */
unsigned portLONG ulCriticalNesting = ( unsigned portLONG ) 9999;
/* Tick interrupt routines for cooperative and preemptive operation
/* Tick interrupt routines for cooperative and preemptive operation
respectively. The preemptive version is not defined as __irq as it is called
from an asm wrapper function. */
__arm __irq void vPortNonPreemptiveTick( void );
@ -145,6 +146,13 @@ portSTACK_TYPE *pxOriginalTOS;
/* The status register is set for system mode, with interrupts enabled. */
*pxTopOfStack = ( portSTACK_TYPE ) portINITIAL_SPSR;
if( ( ( unsigned long ) pxCode & 0x01UL ) != 0x00UL )
{
/* We want the task to start in thumb mode. */
*pxTopOfStack |= portTHUMB_MODE_BIT;
}
pxTopOfStack--;
/* Interrupt flags cannot always be stored on the stack and will
@ -202,7 +210,7 @@ void vPortPreemptiveTick( void )
vTaskIncrementTick();
/* The new tick value might unblock a task. Ensure the highest task that
is ready to execute is the task that will execute when the tick ISR
is ready to execute is the task that will execute when the tick ISR
exits. */
vTaskSwitchContext();