mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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141 lines
5.3 KiB
ArmAsm
141 lines
5.3 KiB
ArmAsm
/*
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FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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>>>NOTE<<< The modification to the GPL is included to allow you to
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distribute a combined work that includes FreeRTOS without being obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong? *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, training, latest information,
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license and contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool.
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Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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the code with commercial support, indemnification, and middleware, under
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the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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provide a safety engineered and independently SIL3 certified version under
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the SafeRTOS brand: http://www.SafeRTOS.com.
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*/
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.global _vPortYield
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.extern _vTaskSwitchContext
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.extern uxCriticalNesting
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_vPortYield:
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PUSH SR /* Save the SR used by the task.... */
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PUSH W0 /* ....then disable interrupts. */
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MOV #32, W0
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MOV W0, SR
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PUSH W1 /* Save registers to the stack. */
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PUSH.D W2
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PUSH.D W4
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PUSH.D W6
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PUSH.D W8
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PUSH.D W10
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PUSH.D W12
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PUSH W14
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PUSH RCOUNT
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PUSH TBLPAG
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PUSH ACCAL
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PUSH ACCAH
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PUSH ACCAU
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PUSH ACCBL
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PUSH ACCBH
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PUSH ACCBU
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PUSH DCOUNT
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PUSH DOSTARTL
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PUSH DOSTARTH
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PUSH DOENDL
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PUSH DOENDH
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PUSH CORCON
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PUSH PSVPAG
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MOV _uxCriticalNesting, W0 /* Save the critical nesting counter for the task. */
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PUSH W0
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MOV _pxCurrentTCB, W0 /* Save the new top of stack into the TCB. */
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MOV W15, [W0]
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call _vTaskSwitchContext
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MOV _pxCurrentTCB, W0 /* Restore the stack pointer for the task. */
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MOV [W0], W15
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POP W0 /* Restore the critical nesting counter for the task. */
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MOV W0, _uxCriticalNesting
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POP PSVPAG
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POP CORCON
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POP DOENDH
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POP DOENDL
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POP DOSTARTH
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POP DOSTARTL
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POP DCOUNT
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POP ACCBU
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POP ACCBH
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POP ACCBL
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POP ACCAU
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POP ACCAH
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POP ACCAL
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POP TBLPAG
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POP RCOUNT /* Restore the registers from the stack. */
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POP W14
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POP.D W12
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POP.D W10
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POP.D W8
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POP.D W6
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POP.D W4
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POP.D W2
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POP.D W0
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POP SR
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return
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.end
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