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; FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd.
; 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 exception 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.
; Alternative commercial license and support terms are also available upon
; request. See the licensing section of for full
; license details.
; 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.
; ***************************************************************************
; * *
; * Looking for a quick start? Then check out the FreeRTOS eBook! *
; * See for details *
; * *
; ***************************************************************************
; 1 tab == 4 spaces!
; Please ensure to read the configuration and relevant port sections of the
; online documentation.
; - Documentation, latest information, license and
; contact details.
; - A version that is certified for use in safety
; critical systems.
; - Commercial support, development, porting,
; licensing and training services.
IMPORT ulCriticalNesting ;
IMPORT pxCurrentTCB ;
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.
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.
; /**********************************************************************/
STMDB SP!, {R0} ; Store R0 first as we need to use it.
STMDB SP,{SP}^ ; Set R0 to point to the task stack pointer.
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.
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] ;