|
|
|
|
;/*
|
|
|
|
|
; 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 http://www.FreeRTOS.org 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 http://www.FreeRTOS.org/Documentation for details *
|
|
|
|
|
; * *
|
|
|
|
|
; ***************************************************************************
|
|
|
|
|
;
|
|
|
|
|
; 1 tab == 4 spaces!
|
|
|
|
|
;
|
|
|
|
|
; 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
|
|
|
|
|
|
