2 ; * FreeRTOS Kernel V10.3.0
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3 ; * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 ; * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 ; * this software and associated documentation files (the "Software"), to deal in
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9 ; * the Software, and to permit persons to whom the Software is furnished to do so,
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10 ; * subject to the following conditions:
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12 ; * The above copyright notice and this permission notice shall be included in all
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13 ; * copies or substantial portions of the Software.
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15 ; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 ; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 ; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 ; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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22 ; * http://www.FreeRTOS.org
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23 ; * http://aws.amazon.com/freertos
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25 ; * 1 tab == 4 spaces!
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29 EXTERN ulCriticalNesting
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31 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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32 ; Context save and restore macro definitions
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33 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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35 portSAVE_CONTEXT MACRO
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37 ; Push R0 as we are going to use the register.
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40 ; Set R0 to point to the task stack pointer.
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46 ; Push the return address onto the stack.
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49 ; Now we have saved LR we can use it instead of R0.
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52 ; Pop R0 so we can save it onto the system mode stack.
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55 ; Push all the system mode registers onto the task stack.
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60 ; Push the SPSR onto the task stack.
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64 LDR R0, =ulCriticalNesting
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68 ; Store the new top of stack for the task.
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69 LDR R1, =pxCurrentTCB
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76 portRESTORE_CONTEXT MACRO
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78 ; Set the LR to the task stack.
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79 LDR R1, =pxCurrentTCB
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83 ; The critical nesting depth is the first item on the stack.
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84 ; Load it into the ulCriticalNesting variable.
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85 LDR R0, =ulCriticalNesting
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89 ; Get the SPSR from the stack.
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93 ; Restore all system mode registers for the task.
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97 ; Restore the return address.
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100 ; And return - correcting the offset in the LR to obtain the
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