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FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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* FreeRTOS tutorial books are available in pdf and paperback. *
* Complete, revised, and edited pdf reference manuals are also *
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* 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! *
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* >>> See for details. <<< *
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* Thank you for using FreeRTOS, and thank you for your support! *
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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
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: and also obtained by
writing to Real Time Engineers Ltd., contact details for whom are available
on the FreeRTOS WEB site.
1 tab == 4 spaces!
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* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong?" *
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*************************************************************************** - Documentation, books, training, latest versions,
license and Real Time Engineers Ltd. contact details. - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, and our new
fully thread aware and reentrant UDP/IP stack. - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems, who sell the code with commercial support,
indemnification and middleware, under the OpenRTOS brand. - High Integrity Systems also provide a safety
engineered and independently SIL3 certified version for use in safety and
mission critical applications that require provable dependability.
EXTERN usCriticalNesting
#include "FreeRTOSConfig.h"
; Context save and restore macro definitions
add -0x0C,sp ; prepare stack to save necessary values
st.w lp,8[sp] ; store LP to stack
stsr 0,r31
st.w lp,4[sp] ; store EIPC to stack
stsr 1,lp
st.w lp,0[sp] ; store EIPSW to stack
#if configDATA_MODE == 1 ; Using the Tiny data model
prepare {r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30},76,sp ; save general purpose registers
sst.w r19,72[ep]
sst.w r18,68[ep]
sst.w r17,64[ep]
sst.w r16,60[ep]
sst.w r15,56[ep]
sst.w r14,52[ep]
sst.w r13,48[ep]
sst.w r12,44[ep]
sst.w r11,40[ep]
sst.w r10,36[ep]
sst.w r9,32[ep]
sst.w r8,28[ep]
sst.w r7,24[ep]
sst.w r6,20[ep]
sst.w r5,16[ep]
sst.w r4,12[ep]
#else ; Using the Small/Large data model
prepare {r20,r21,r22,r23,r24,r26,r27,r28,r29,r30},72,sp ; save general purpose registers
sst.w r19,68[ep]
sst.w r18,64[ep]
sst.w r17,60[ep]
sst.w r16,56[ep]
sst.w r15,52[ep]
sst.w r14,48[ep]
sst.w r13,44[ep]
sst.w r12,40[ep]
sst.w r11,36[ep]
sst.w r10,32[ep]
sst.w r9,28[ep]
sst.w r8,24[ep]
sst.w r7,20[ep]
sst.w r6,16[ep]
sst.w r5,12[ep]
#endif /* configDATA_MODE */
sst.w r2,8[ep]
sst.w r1,4[ep]
MOVHI hi1(usCriticalNesting),r0,r1 ; save usCriticalNesting value to stack
ld.w lw1(usCriticalNesting)[r1],r2
sst.w r2,0[ep]
MOVHI hi1(pxCurrentTCB),r0,r1 ; save SP to top of current TCB
ld.w lw1(pxCurrentTCB)[r1],r2
st.w sp,0[r2]
MOVHI hi1(pxCurrentTCB),r0,r1 ; get Stackpointer address
ld.w lw1(pxCurrentTCB)[r1],sp
MOV sp,r1
ld.w 0[r1],sp ; load stackpointer
MOV sp,ep ; set stack pointer to element pointer
sld.w 0[ep],r1 ; load usCriticalNesting value from stack
MOVHI hi1(usCriticalNesting),r0,r2
st.w r1,lw1(usCriticalNesting)[r2]
sld.w 4[ep],r1 ; restore general purpose registers
sld.w 8[ep],r2
#if configDATA_MODE == 1 ; Using Tiny data model
sld.w 12[ep],r4
sld.w 16[ep],r5
sld.w 20[ep],r6
sld.w 24[ep],r7
sld.w 28[ep],r8
sld.w 32[ep],r9
sld.w 36[ep],r10
sld.w 40[ep],r11
sld.w 44[ep],r12
sld.w 48[ep],r13
sld.w 52[ep],r14
sld.w 56[ep],r15
sld.w 60[ep],r16
sld.w 64[ep],r17
sld.w 68[ep],r18
sld.w 72[ep],r19
dispose 76,{r20,r21,r22,r23,r24,r25,r26,r27,r28,r29,r30}
#else ; Using Small/Large data model
sld.w 12[ep],r5
sld.w 16[ep],r6
sld.w 20[ep],r7
sld.w 24[ep],r8
sld.w 28[ep],r9
sld.w 32[ep],r10
sld.w 36[ep],r11
sld.w 40[ep],r12
sld.w 44[ep],r13
sld.w 48[ep],r14
sld.w 52[ep],r15
sld.w 56[ep],r16
sld.w 60[ep],r17
sld.w 64[ep],r18
sld.w 68[ep],r19
dispose 72,{r20,r21,r22,r23,r24,r26,r27,r28,r29,r30}
#endif /* configDATA_MODE */
ld.w 0[sp],lp ; restore EIPSW from stack
ldsr lp,1
ld.w 4[sp],lp ; restore EIPC from stack
ldsr lp,0
ld.w 8[sp],lp ; restore LP from stack
add 0x0C,sp ; set SP to right position