;/* | |
; FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd. | |
; | |
; | |
; *************************************************************************** | |
; * * | |
; * FreeRTOS tutorial books are available in pdf and paperback. * | |
; * Complete, revised, and edited pdf reference manuals are also * | |
; * available. * | |
; * * | |
; * Purchasing FreeRTOS documentation will not only help you, by * | |
; * ensuring you get running as quickly as possible and with an * | |
; * in-depth knowledge of how to use FreeRTOS, it will also help * | |
; * the FreeRTOS project to continue with its mission of providing * | |
; * professional grade, cross platform, de facto standard solutions * | |
; * for microcontrollers - completely free of charge! * | |
; * * | |
; * >>> See http://www.FreeRTOS.org/Documentation for details. <<< * | |
; * * | |
; * Thank you for using FreeRTOS, and thank you for your support! * | |
; * * | |
; *************************************************************************** | |
; | |
; | |
; 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 (version 2) as published by the | |
; Free Software Foundation AND MODIFIED BY the FreeRTOS exception. | |
; >>>NOTE<<< The modification to the GPL is included to allow you to | |
; distribute a combined work that includes FreeRTOS without being obliged to | |
; provide the source code for proprietary components outside of the FreeRTOS | |
; kernel. 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 and the FreeRTOS license exception along with FreeRTOS; if not it | |
; can be viewed here: http://www.freertos.org/a00114.html and also obtained | |
; by writing to Richard Barry, contact details for whom are available on the | |
; FreeRTOS WEB site. | |
; | |
; 1 tab == 4 spaces! | |
; | |
; 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. | |
;*/ | |
IMPORT ulCriticalNesting ; | |
IMPORT pxCurrentTCB ; | |
MACRO | |
portRESTORE_CONTEXT | |
LDR R0, =pxCurrentTCB ; Set the LR to the task stack. The location was... | |
LDR R0, [R0] ; ... stored in pxCurrentTCB | |
LDR LR, [R0] | |
LDR R0, =ulCriticalNesting ; The critical nesting depth is the first item on... | |
LDMFD LR!, {R1} ; ...the stack. Load it into the ulCriticalNesting var. | |
STR R1, [R0] ; | |
LDMFD LR!, {R0} ; Get the SPSR from the stack. | |
MSR SPSR_cxsf, R0 ; | |
LDMFD LR, {R0-R14}^ ; Restore all system mode registers for the task. | |
NOP ; | |
LDR LR, [LR, #+60] ; Restore the return address | |
; And return - correcting the offset in the LR to obtain ... | |
SUBS PC, LR, #4 ; ...the correct address. | |
MEND | |
; /**********************************************************************/ | |
MACRO | |
portSAVE_CONTEXT | |
STMDB SP!, {R0} ; Store R0 first as we need to use it. | |
STMDB SP,{SP}^ ; Set R0 to point to the task stack pointer. | |
NOP ; | |
SUB SP, SP, #4 ; | |
LDMIA SP!,{R0} ; | |
STMDB R0!, {LR} ; Push the return address onto the stack. | |
MOV LR, R0 ; Now we have saved LR we can use it instead of R0. | |
LDMIA SP!, {R0} ; Pop R0 so we can save it onto the system mode stack. | |
STMDB LR,{R0-LR}^ ; Push all the system mode registers onto the task stack. | |
NOP ; | |
SUB LR, LR, #60 ; | |
MRS R0, SPSR ; Push the SPSR onto the task stack. | |
STMDB LR!, {R0} ; | |
LDR R0, =ulCriticalNesting ; | |
LDR R0, [R0] ; | |
STMDB LR!, {R0} ; | |
LDR R0, =pxCurrentTCB ; Store the new top of stack for the task. | |
LDR R1, [R0] ; | |
STR LR, [R1] ; | |
MEND | |
END |