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

 /*
     FreeRTOS V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
     All rights reserved

     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

     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.  Full license text is available on the following
     link: http://www.freertos.org/a00114.html

     ***************************************************************************
      *                                                                       *
      *    FreeRTOS provides completely free yet professionally developed,    *
      *    robust, strictly quality controlled, supported, and cross          *
      *    platform software that is more than just the market leader, it     *
      *    is the industry's de facto standard.                               *
      *                                                                       *
      *    Help yourself get started quickly while simultaneously helping     *
      *    to support the FreeRTOS project by purchasing a FreeRTOS           *
      *    tutorial book, reference manual, or both:                          *
      *    http://www.FreeRTOS.org/Documentation                              *
      *                                                                       *
     ***************************************************************************

     http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
 	the FAQ page "My application does not run, what could be wrong?".  Have you
 	defined configASSERT()?

 	http://www.FreeRTOS.org/support - In return for receiving this top quality
 	embedded software for free we request you assist our global community by
 	participating in the support forum.

 	http://www.FreeRTOS.org/training - Investing in training allows your team to
 	be as productive as possible as early as possible.  Now you can receive
 	FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
 	Ltd, and the world's leading authority on the world's leading RTOS.

     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
     including FreeRTOS+Trace - an indispensable productivity tool, a DOS
     compatible FAT file system, and our tiny thread aware UDP/IP stack.

     http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
     Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

     http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
     Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
     licenses offer ticketed support, indemnification and commercial middleware.

     http://www.SafeRTOS.com - 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.

     1 tab == 4 spaces!
 */

 #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 V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
	All rights reserved

	VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

	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. Full license text is available on the following
	link: http://www.freertos.org/a00114.html

	***************************************************************************
	* *
	* FreeRTOS provides completely free yet professionally developed, *
	* robust, strictly quality controlled, supported, and cross *
	* platform software that is more than just the market leader, it *
	* is the industry's de facto standard. *
	* *
	* Help yourself get started quickly while simultaneously helping *
	* to support the FreeRTOS project by purchasing a FreeRTOS *
	* tutorial book, reference manual, or both: *
	* http://www.FreeRTOS.org/Documentation *
	* *
	***************************************************************************

	http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
	the FAQ page "My application does not run, what could be wrong?". Have you
	defined configASSERT()?

	http://www.FreeRTOS.org/support - In return for receiving this top quality
	embedded software for free we request you assist our global community by
	participating in the support forum.

	http://www.FreeRTOS.org/training - Investing in training allows your team to
	be as productive as possible as early as possible. Now you can receive
	FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
	Ltd, and the world's leading authority on the world's leading RTOS.

	http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
	including FreeRTOS+Trace - an indispensable productivity tool, a DOS
	compatible FAT file system, and our tiny thread aware UDP/IP stack.

	http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
	Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

	http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
	Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
	licenses offer ticketed support, indemnification and commercial middleware.

	http://www.SafeRTOS.com - 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.

	1 tab == 4 spaces!
	*/

	#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