2 ; FreeRTOS V8.2.2 - Copyright (C) 2015 Real Time Engineers Ltd.
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3 ; All rights reserved
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6 ; ***************************************************************************
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8 ; * FreeRTOS tutorial books are available in pdf and paperback. *
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9 ; * Complete, revised, and edited pdf reference manuals are also *
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12 ; * Purchasing FreeRTOS documentation will not only help you, by *
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13 ; * ensuring you get running as quickly as possible and with an *
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14 ; * in-depth knowledge of how to use FreeRTOS, it will also help *
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15 ; * the FreeRTOS project to continue with its mission of providing *
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16 ; * professional grade, cross platform, de facto standard solutions *
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17 ; * for microcontrollers - completely free of charge! *
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19 ; * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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21 ; * Thank you for using FreeRTOS, and thank you for your support! *
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23 ; ***************************************************************************
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26 ; This file is part of the FreeRTOS distribution.
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28 ; FreeRTOS is free software; you can redistribute it and/or modify it under
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29 ; the terms of the GNU General Public License (version 2) as published by the
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30 ; Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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31 ; >>>NOTE<<< The modification to the GPL is included to allow you to
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32 ; distribute a combined work that includes FreeRTOS without being obliged to
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33 ; provide the source code for proprietary components outside of the FreeRTOS
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34 ; kernel. FreeRTOS is distributed in the hope that it will be useful, but
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35 ; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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36 ; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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37 ; more details. You should have received a copy of the GNU General Public
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38 ; License and the FreeRTOS license exception along with FreeRTOS; if not it
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39 ; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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40 ; by writing to Richard Barry, contact details for whom are available on the
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41 ; FreeRTOS WEB site.
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43 ; 1 tab == 4 spaces!
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45 ; http://www.FreeRTOS.org - Documentation, latest information, license and
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48 ; http://www.SafeRTOS.com - A version that is certified for use in safety
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51 ; http://www.OpenRTOS.com - Commercial support, development, porting,
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52 ; licensing and training services.
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55 EXTERN vTaskSwitchContext
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56 EXTERN ulCriticalNesting
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58 EXTERN ulPortTaskHasFPUContext
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59 EXTERN ulAsmAPIPriorityMask
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61 portSAVE_CONTEXT macro
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63 ; Save the LR and SPSR onto the system mode stack before switching to
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64 ; system mode to save the remaining system mode registers
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65 SRSDB sp!, #SYS_MODE
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69 ; Push the critical nesting count
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70 LDR R2, =ulCriticalNesting
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74 ; Does the task have a floating point context that needs saving? If
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75 ; ulPortTaskHasFPUContext is 0 then no.
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76 LDR R2, =ulPortTaskHasFPUContext
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80 ; Save the floating point context, if any
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83 #if configFPU_D32 == 1
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85 #endif ; configFPU_D32
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88 ; Save ulPortTaskHasFPUContext itself
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91 ; Save the stack pointer in the TCB
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92 LDR R0, =pxCurrentTCB
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98 ; /**********************************************************************/
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100 portRESTORE_CONTEXT macro
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102 ; Set the SP to point to the stack of the task being restored.
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103 LDR R0, =pxCurrentTCB
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107 ; Is there a floating point context to restore? If the restored
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108 ; ulPortTaskHasFPUContext is zero then no.
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109 LDR R0, =ulPortTaskHasFPUContext
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114 ; Restore the floating point context, if any
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116 #if configFPU_D32 == 1
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118 #endif ; configFPU_D32
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122 ; Restore the critical section nesting depth
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123 LDR R0, =ulCriticalNesting
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127 ; Restore all system mode registers other than the SP (which is already
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131 ; Return to the task code, loading CPSR on the way. CPSR has the interrupt
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132 ; enable bit set appropriately for the task about to execute.
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