mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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122 lines
3.5 KiB
ArmAsm
122 lines
3.5 KiB
ArmAsm
/*
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FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd.
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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 exception to the GPL is included to allow you to distribute a
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combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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Alternative commercial license and support terms are also available upon
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request. See the licensing section of http://www.FreeRTOS.org for full
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license details.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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***************************************************************************
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* *
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* Looking for a quick start? Then check out the FreeRTOS eBook! *
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* See http://www.FreeRTOS.org/Documentation for details *
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* *
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***************************************************************************
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1 tab == 4 spaces!
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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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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