/* | |
FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 Richard Barry. | |
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 as published by | |
the Free Software Foundation; either version 2 of the License, or | |
(at your option) any later version. | |
FreeRTOS is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
GNU General Public License for more details. | |
You should have received a copy of the GNU General Public License | |
along with FreeRTOS; if not, write to the Free Software | |
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
A special exception to the GPL can be applied should you wish to distribute | |
a combined work that includes FreeRTOS, without being obliged to provide | |
the source code for any proprietary components. See the licensing section | |
of http://www.FreeRTOS.org for full details of how and when the exception | |
can be applied. | |
*************************************************************************** | |
*************************************************************************** | |
* * | |
* SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, * | |
* and even write all or part of your application on your behalf. * | |
* See http://www.OpenRTOS.com for details of the services we provide to * | |
* expedite your project. * | |
* * | |
*************************************************************************** | |
*************************************************************************** | |
Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
http://www.FreeRTOS.org - Documentation, latest information, license and | |
contact details. | |
http://www.SafeRTOS.com - A version that is certified for use in safety | |
critical systems. | |
http://www.OpenRTOS.com - Commercial support, development, porting, | |
licensing and training services. | |
*/ | |
EXTERN pxCurrentTCB | |
EXTERN ulCriticalNesting | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
; Context save and restore macro definitions | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
portSAVE_CONTEXT MACRO | |
; Push R0 as we are going to use the register. | |
STMDB SP!, {R0} | |
; Set R0 to point to the task stack pointer. | |
STMDB SP, {SP}^ | |
NOP | |
SUB SP, SP, #4 | |
LDMIA SP!, {R0} | |
; Push the return address onto the stack. | |
STMDB R0!, {LR} | |
; Now we have saved LR we can use it instead of R0. | |
MOV LR, R0 | |
; Pop R0 so we can save it onto the system mode stack. | |
LDMIA SP!, {R0} | |
; Push all the system mode registers onto the task stack. | |
STMDB LR, {R0-LR}^ | |
NOP | |
SUB LR, LR, #60 | |
; Push the SPSR onto the task stack. | |
MRS R0, SPSR | |
STMDB LR!, {R0} | |
LDR R0, =ulCriticalNesting | |
LDR R0, [R0] | |
STMDB LR!, {R0} | |
; Store the new top of stack for the task. | |
LDR R1, =pxCurrentTCB | |
LDR R0, [R1] | |
STR LR, [R0] | |
ENDM | |
portRESTORE_CONTEXT MACRO | |
; Set the LR to the task stack. | |
LDR R1, =pxCurrentTCB | |
LDR R0, [R1] | |
LDR LR, [R0] | |
; The critical nesting depth is the first item on the stack. | |
; Load it into the ulCriticalNesting variable. | |
LDR R0, =ulCriticalNesting | |
LDMFD LR!, {R1} | |
STR R1, [R0] | |
; Get the SPSR from the stack. | |
LDMFD LR!, {R0} | |
MSR SPSR_cxsf, R0 | |
; Restore all system mode registers for the task. | |
LDMFD LR, {R0-R14}^ | |
NOP | |
; Restore the return address. | |
LDR LR, [LR, #+60] | |
; And return - correcting the offset in the LR to obtain the | |
; correct address. | |
SUBS PC, LR, #4 | |
ENDM | |