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114 lines
4.0 KiB
PHTML
114 lines
4.0 KiB
PHTML
;/*
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; FreeRTOS.org V5.1.1 - Copyright (C) 2003-2008 Richard Barry.
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;
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; This file is part of the FreeRTOS.org distribution.
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;
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; FreeRTOS.org is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; FreeRTOS.org is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with FreeRTOS.org; if not, write to the Free Software
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; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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;
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; A special exception to the GPL can be applied should you wish to distribute
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; a combined work that includes FreeRTOS.org, without being obliged to provide
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; the source code for any proprietary components. See the licensing section
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; of http://www.FreeRTOS.org for full details of how and when the exception
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; can be applied.
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;
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; ***************************************************************************
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; ***************************************************************************
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; * *
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; * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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; * and even write all or part of your application on your behalf. *
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; * See http://www.OpenRTOS.com for details of the services we provide to *
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; * expedite your project. *
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; * *
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; ***************************************************************************
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; ***************************************************************************
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;
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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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;
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; http://www.FreeRTOS.org - Documentation, latest information, license and
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; contact details.
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;
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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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;
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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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IMPORT ulCriticalNesting ;
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IMPORT pxCurrentTCB ;
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MACRO
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portRESTORE_CONTEXT
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LDR R0, =pxCurrentTCB ; Set the LR to the task stack. The location was...
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LDR R0, [R0] ; ... stored in pxCurrentTCB
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LDR LR, [R0]
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LDR R0, =ulCriticalNesting ; The critical nesting depth is the first item on...
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LDMFD LR!, {R1} ; ...the stack. Load it into the ulCriticalNesting var.
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STR R1, [R0] ;
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LDMFD LR!, {R0} ; Get the SPSR from the stack.
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MSR SPSR_cxsf, R0 ;
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LDMFD LR, {R0-R14}^ ; Restore all system mode registers for the task.
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NOP ;
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LDR LR, [LR, #+60] ; Restore the return address
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; And return - correcting the offset in the LR to obtain ...
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SUBS PC, LR, #4 ; ...the correct address.
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MEND
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; /**********************************************************************/
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MACRO
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portSAVE_CONTEXT
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STMDB SP!, {R0} ; Store R0 first as we need to use it.
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STMDB SP,{SP}^ ; Set R0 to point to the task stack pointer.
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NOP ;
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SUB SP, SP, #4 ;
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LDMIA SP!,{R0} ;
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STMDB R0!, {LR} ; Push the return address onto the stack.
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MOV LR, R0 ; Now we have saved LR we can use it instead of R0.
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LDMIA SP!, {R0} ; Pop R0 so we can save it onto the system mode stack.
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STMDB LR,{R0-LR}^ ; Push all the system mode registers onto the task stack.
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NOP ;
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SUB LR, LR, #60 ;
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MRS R0, SPSR ; Push the SPSR onto the task stack.
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STMDB LR!, {R0} ;
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LDR R0, =ulCriticalNesting ;
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LDR R0, [R0] ;
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STMDB LR!, {R0} ;
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LDR R0, =pxCurrentTCB ; Store the new top of stack for the task.
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LDR R1, [R0] ;
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STR LR, [R1] ;
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MEND
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END
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