2 ; FreeRTOS V8.2.2 - Copyright (C) 2015 Real Time Engineers Ltd.
\r
3 ; All rights reserved
\r
6 ; ***************************************************************************
\r
8 ; * FreeRTOS tutorial books are available in pdf and paperback. *
\r
9 ; * Complete, revised, and edited pdf reference manuals are also *
\r
12 ; * Purchasing FreeRTOS documentation will not only help you, by *
\r
13 ; * ensuring you get running as quickly as possible and with an *
\r
14 ; * in-depth knowledge of how to use FreeRTOS, it will also help *
\r
15 ; * the FreeRTOS project to continue with its mission of providing *
\r
16 ; * professional grade, cross platform, de facto standard solutions *
\r
17 ; * for microcontrollers - completely free of charge! *
\r
19 ; * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
\r
21 ; * Thank you for using FreeRTOS, and thank you for your support! *
\r
23 ; ***************************************************************************
\r
26 ; This file is part of the FreeRTOS distribution.
\r
28 ; FreeRTOS is free software; you can redistribute it and/or modify it under
\r
29 ; the terms of the GNU General Public License (version 2) as published by the
\r
30 ; Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
\r
31 ; >>>NOTE<<< The modification to the GPL is included to allow you to
\r
32 ; distribute a combined work that includes FreeRTOS without being obliged to
\r
33 ; provide the source code for proprietary components outside of the FreeRTOS
\r
34 ; kernel. FreeRTOS is distributed in the hope that it will be useful, but
\r
35 ; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
\r
36 ; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
\r
37 ; more details. You should have received a copy of the GNU General Public
\r
38 ; License and the FreeRTOS license exception along with FreeRTOS; if not it
\r
39 ; can be viewed here: http://www.freertos.org/a00114.html and also obtained
\r
40 ; by writing to Richard Barry, contact details for whom are available on the
\r
41 ; FreeRTOS WEB site.
\r
43 ; 1 tab == 4 spaces!
\r
45 ; http://www.FreeRTOS.org - Documentation, latest information, license and
\r
48 ; http://www.SafeRTOS.com - A version that is certified for use in safety
\r
51 ; http://www.OpenRTOS.com - Commercial support, development, porting,
\r
52 ; licensing and training services.
\r
55 EXTERN vTaskSwitchContext
\r
56 EXTERN ulCriticalNesting
\r
58 EXTERN ulPortTaskHasFPUContext
\r
59 EXTERN ulAsmAPIPriorityMask
\r
61 portSAVE_CONTEXT macro
\r
63 ; Save the LR and SPSR onto the system mode stack before switching to
\r
64 ; system mode to save the remaining system mode registers
\r
65 SRSDB sp!, #SYS_MODE
\r
69 ; Push the critical nesting count
\r
70 LDR R2, =ulCriticalNesting
\r
74 ; Does the task have a floating point context that needs saving? If
\r
75 ; ulPortTaskHasFPUContext is 0 then no.
\r
76 LDR R2, =ulPortTaskHasFPUContext
\r
80 ; Save the floating point context, if any
\r
86 ; Save ulPortTaskHasFPUContext itself
\r
89 ; Save the stack pointer in the TCB
\r
90 LDR R0, =pxCurrentTCB
\r
96 ; /**********************************************************************/
\r
98 portRESTORE_CONTEXT macro
\r
100 ; Set the SP to point to the stack of the task being restored.
\r
101 LDR R0, =pxCurrentTCB
\r
105 ; Is there a floating point context to restore? If the restored
\r
106 ; ulPortTaskHasFPUContext is zero then no.
\r
107 LDR R0, =ulPortTaskHasFPUContext
\r
112 ; Restore the floating point context, if any
\r
118 ; Restore the critical section nesting depth
\r
119 LDR R0, =ulCriticalNesting
\r
123 ; Ensure the priority mask is correct for the critical nesting depth
\r
124 LDR R2, =portICCPMR_PRIORITY_MASK_REGISTER_ADDRESS
\r
127 LDRNE R4, =( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT )
\r
130 ; Restore all system mode registers other than the SP (which is already
\r
134 ; Return to the task code, loading CPSR on the way.
\r