1 ; FreeRTOS.org V4.3.0 - Copyright (C) 2003-2007 Richard Barry.
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3 ; This file is part of the FreeRTOS.org distribution.
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28 ; port sections of the online documentation.
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29 ; ***************************************************************************
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32 EXTERN ulCriticalNesting
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34 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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35 ; Context save and restore macro definitions
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36 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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38 portSAVE_CONTEXT MACRO
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40 ; Push R0 as we are going to use the register.
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43 ; Set R0 to point to the task stack pointer.
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49 ; Push the return address onto the stack.
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52 ; Now we have saved LR we can use it instead of R0.
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55 ; Pop R0 so we can save it onto the system mode stack.
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58 ; Push all the system mode registers onto the task stack.
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63 ; Push the SPSR onto the task stack.
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67 LDR R0, =ulCriticalNesting
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71 ; Store the new top of stack for the task.
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72 LDR R1, =pxCurrentTCB
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79 portRESTORE_CONTEXT MACRO
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81 ; Set the LR to the task stack.
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82 LDR R1, =pxCurrentTCB
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86 ; The critical nesting depth is the first item on the stack.
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87 ; Load it into the ulCriticalNesting variable.
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88 LDR R0, =ulCriticalNesting
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92 ; Get the SPSR from the stack.
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96 ; Restore all system mode registers for the task.
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100 ; Restore the return address.
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103 ; And return - correcting the offset in the LR to obtain the
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104 ; correct address.
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