FreeRTOS/Source/portable/IAR/RX600/port_asm.s - third_party/github/FreeRTOS/FreeRTOS-Kernel - Git at Google

 /*
     FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.


     ***************************************************************************
      *                                                                       *
      *    FreeRTOS tutorial books are available in pdf and paperback.        *
      *    Complete, revised, and edited pdf reference manuals are also       *
      *    available.                                                         *
      *                                                                       *
      *    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!                  *
      *                                                                       *
      *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
      *                                                                       *
      *    Thank you for using FreeRTOS, and thank you for your support!      *
      *                                                                       *
     ***************************************************************************


     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
     kernel.  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: http://www.freertos.org/a00114.html and also obtained
     by writing to Richard Barry, contact details for whom are available on the
     FreeRTOS WEB site.

     1 tab == 4 spaces!

     ***************************************************************************
      *                                                                       *
      *    Having a problem?  Start by reading the FAQ "My application does   *
      *    not run, what could be wrong?                                      *
      *                                                                       *
      *    http://www.FreeRTOS.org/FAQHelp.html                               *
      *                                                                       *
     ***************************************************************************


     http://www.FreeRTOS.org - Documentation, training, latest information,
     license and contact details.

     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
     including FreeRTOS+Trace - an indispensable productivity tool.

     Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
     the code with commercial support, indemnification, and middleware, under
     the OpenRTOS brand: http://www.OpenRTOS.com.  High Integrity Systems also
     provide a safety engineered and independently SIL3 certified version under
     the SafeRTOS brand: http://www.SafeRTOS.com.
 */

 #include "PriorityDefinitions.h"

 	PUBLIC _prvStartFirstTask
 	PUBLIC ___interrupt_27

 	EXTERN _pxCurrentTCB
 	EXTERN _vTaskSwitchContext

 	RSEG CODE:CODE(4)

 _prvStartFirstTask:

 		/* When starting the scheduler there is nothing that needs moving to the
 		interrupt stack because the function is not called from an interrupt.
 		Just ensure the current stack is the user stack. */
 		SETPSW		U

 		/* Obtain the location of the stack associated with which ever task
 		pxCurrentTCB is currently pointing to. */
 		MOV.L		#_pxCurrentTCB, R15
 		MOV.L		[R15], R15
 		MOV.L		[R15], R0

 		/* Restore the registers from the stack of the task pointed to by
 		pxCurrentTCB. */
 		POP			R15

 		/* Accumulator low 32 bits. */
 		MVTACLO		R15
 		POP			R15

 		/* Accumulator high 32 bits. */
 		MVTACHI		R15
 		POP			R15

 		/* Floating point status word. */
 		MVTC		R15, FPSW

 		/* R1 to R15 - R0 is not included as it is the SP. */
 		POPM		R1-R15

 		/* This pops the remaining registers. */
 		RTE
 		NOP
 		NOP

 /*-----------------------------------------------------------*/

 /* The software interrupt - overwrite the default 'weak' definition. */
 ___interrupt_27:

 		/* Re-enable interrupts. */
 		SETPSW		I

 		/* Move the data that was automatically pushed onto the interrupt stack when
 		the interrupt occurred from the interrupt stack to the user stack.

 		R15 is saved before it is clobbered. */
 		PUSH.L		R15

 		/* Read the user stack pointer. */
 		MVFC		USP, R15

 		/* Move the address down to the data being moved. */
 		SUB			#12, R15
 		MVTC		R15, USP

 		/* Copy the data across, R15, then PC, then PSW. */
 		MOV.L		[ R0 ], [ R15 ]
 		MOV.L 		4[ R0 ], 4[ R15 ]
 		MOV.L		8[ R0 ], 8[ R15 ]

 		/* Move the interrupt stack pointer to its new correct position. */
 		ADD		#12, R0

 		/* All the rest of the registers are saved directly to the user stack. */
 		SETPSW		U

 		/* Save the rest of the general registers (R15 has been saved already). */
 		PUSHM		R1-R14

 		/* Save the FPSW and accumulator. */
 		MVFC		FPSW, R15
 		PUSH.L		R15
 		MVFACHI 	R15
 		PUSH.L		R15

 		/* Middle word. */
 		MVFACMI	R15

 		/* Shifted left as it is restored to the low order word. */
 		SHLL		#16, R15
 		PUSH.L		R15

 		/* Save the stack pointer to the TCB. */
 		MOV.L		#_pxCurrentTCB, R15
 		MOV.L		[ R15 ], R15
 		MOV.L		R0, [ R15 ]

 		/* Ensure the interrupt mask is set to the syscall priority while the kernel
 		structures are being accessed. */
 		MVTIPL		#configMAX_SYSCALL_INTERRUPT_PRIORITY

 		/* Select the next task to run. */
 		BSR.A		_vTaskSwitchContext

 		/* Reset the interrupt mask as no more data structure access is required. */
 		MVTIPL		#configKERNEL_INTERRUPT_PRIORITY

 		/* Load the stack pointer of the task that is now selected as the Running
 		state task from its TCB. */
 		MOV.L		#_pxCurrentTCB,R15
 		MOV.L		[ R15 ], R15
 		MOV.L		[ R15 ], R0

 		/* Restore the context of the new task.  The PSW (Program Status Word) and
 		PC will be popped by the RTE instruction. */
 		POP			R15
 		MVTACLO 	R15
 		POP			R15
 		MVTACHI 	R15
 		POP			R15
 		MVTC		R15, FPSW
 		POPM		R1-R15
 		RTE
 		NOP
 		NOP

 /*-----------------------------------------------------------*/

 		END
	/*
	FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.


	***************************************************************************
	* *
	* FreeRTOS tutorial books are available in pdf and paperback. *
	* Complete, revised, and edited pdf reference manuals are also *
	* available. *
	* *
	* 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! *
	* *
	* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
	* *
	* Thank you for using FreeRTOS, and thank you for your support! *
	* *
	***************************************************************************


	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
	kernel. 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: http://www.freertos.org/a00114.html and also obtained
	by writing to Richard Barry, contact details for whom are available on the
	FreeRTOS WEB site.

	1 tab == 4 spaces!

	***************************************************************************
	* *
	* Having a problem? Start by reading the FAQ "My application does *
	* not run, what could be wrong? *
	* *
	* http://www.FreeRTOS.org/FAQHelp.html *
	* *
	***************************************************************************


	http://www.FreeRTOS.org - Documentation, training, latest information,
	license and contact details.

	http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
	including FreeRTOS+Trace - an indispensable productivity tool.

	Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
	the code with commercial support, indemnification, and middleware, under
	the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
	provide a safety engineered and independently SIL3 certified version under
	the SafeRTOS brand: http://www.SafeRTOS.com.
	*/

	#include "PriorityDefinitions.h"

	PUBLIC _prvStartFirstTask
	PUBLIC ___interrupt_27

	EXTERN _pxCurrentTCB
	EXTERN _vTaskSwitchContext

	RSEG CODE:CODE(4)

	_prvStartFirstTask:

	/* When starting the scheduler there is nothing that needs moving to the
	interrupt stack because the function is not called from an interrupt.
	Just ensure the current stack is the user stack. */
	SETPSW U

	/* Obtain the location of the stack associated with which ever task
	pxCurrentTCB is currently pointing to. */
	MOV.L #_pxCurrentTCB, R15
	MOV.L [R15], R15
	MOV.L [R15], R0

	/* Restore the registers from the stack of the task pointed to by
	pxCurrentTCB. */
	POP R15

	/* Accumulator low 32 bits. */
	MVTACLO R15
	POP R15

	/* Accumulator high 32 bits. */
	MVTACHI R15
	POP R15

	/* Floating point status word. */
	MVTC R15, FPSW

	/* R1 to R15 - R0 is not included as it is the SP. */
	POPM R1-R15

	/* This pops the remaining registers. */
	RTE
	NOP
	NOP

	/-----------------------------------------------------------/

	/* The software interrupt - overwrite the default 'weak' definition. */
	___interrupt_27:

	/* Re-enable interrupts. */
	SETPSW I

	/* Move the data that was automatically pushed onto the interrupt stack when
	the interrupt occurred from the interrupt stack to the user stack.

	R15 is saved before it is clobbered. */
	PUSH.L R15

	/* Read the user stack pointer. */
	MVFC USP, R15

	/* Move the address down to the data being moved. */
	SUB #12, R15
	MVTC R15, USP

	/* Copy the data across, R15, then PC, then PSW. */
	MOV.L [ R0 ], [ R15 ]
	MOV.L 4[ R0 ], 4[ R15 ]
	MOV.L 8[ R0 ], 8[ R15 ]

	/* Move the interrupt stack pointer to its new correct position. */
	ADD #12, R0

	/* All the rest of the registers are saved directly to the user stack. */
	SETPSW U

	/* Save the rest of the general registers (R15 has been saved already). */
	PUSHM R1-R14

	/* Save the FPSW and accumulator. */
	MVFC FPSW, R15
	PUSH.L R15
	MVFACHI R15
	PUSH.L R15

	/* Middle word. */
	MVFACMI R15

	/* Shifted left as it is restored to the low order word. */
	SHLL #16, R15
	PUSH.L R15

	/* Save the stack pointer to the TCB. */
	MOV.L #_pxCurrentTCB, R15
	MOV.L [ R15 ], R15
	MOV.L R0, [ R15 ]

	/* Ensure the interrupt mask is set to the syscall priority while the kernel
	structures are being accessed. */
	MVTIPL #configMAX_SYSCALL_INTERRUPT_PRIORITY

	/* Select the next task to run. */
	BSR.A _vTaskSwitchContext

	/* Reset the interrupt mask as no more data structure access is required. */
	MVTIPL #configKERNEL_INTERRUPT_PRIORITY

	/* Load the stack pointer of the task that is now selected as the Running
	state task from its TCB. */
	MOV.L #_pxCurrentTCB,R15
	MOV.L [ R15 ], R15
	MOV.L [ R15 ], R0

	/* Restore the context of the new task. The PSW (Program Status Word) and
	PC will be popped by the RTE instruction. */
	POP R15
	MVTACLO R15
	POP R15
	MVTACHI R15
	POP R15
	MVTC R15, FPSW
	POPM R1-R15
	RTE
	NOP
	NOP

	/-----------------------------------------------------------/

	END