FreeRTOS/Source/portable/IAR/ARM_CM0/portasm.s - third_party/github/FreeRTOS/FreeRTOS-Kernel - Git at Google

 /*
     FreeRTOS V8.2.0rc1 - Copyright (C) 2014 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

     1 tab == 4 spaces!

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

     ***************************************************************************
      *                                                                       *
      *   Investing in training allows your team to be as productive as       *
      *   possible as early as possible, lowering your overall development    *
      *   cost, and enabling you to bring a more robust product to market     *
      *   earlier than would otherwise be possible.  Richard Barry is both    *
      *   the architect and key author of FreeRTOS, and so also the world's   *
      *   leading authority on what is the world's most popular real time     *
      *   kernel for deeply embedded MCU designs.  Obtaining your training    *
      *   from Richard ensures your team will gain directly from his in-depth *
      *   product knowledge and years of usage experience.  Contact Real Time *
      *   Engineers Ltd to enquire about the FreeRTOS Masterclass, presented  *
      *   by Richard Barry:  http://www.FreeRTOS.org/contact
      *                                                                       *
     ***************************************************************************

     ***************************************************************************
      *                                                                       *
      *    You are receiving this top quality software for free.  Please play *
      *    fair and reciprocate by reporting any suspected issues and         *
      *    participating in the community forum:                              *
      *    http://www.FreeRTOS.org/support                                    *
      *                                                                       *
      *    Thank you!                                                         *
      *                                                                       *
     ***************************************************************************

     http://www.FreeRTOS.org - Documentation, books, training, latest versions,
     license and Real Time Engineers Ltd. contact details.

     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 <FreeRTOSConfig.h>

 	RSEG    CODE:CODE(2)
 	thumb

 	EXTERN vPortYieldFromISR
 	EXTERN pxCurrentTCB
 	EXTERN vTaskSwitchContext

 	PUBLIC vSetMSP
 	PUBLIC xPortPendSVHandler
 	PUBLIC vPortSVCHandler
 	PUBLIC vPortStartFirstTask
 	PUBLIC ulSetInterruptMaskFromISR
 	PUBLIC vClearInterruptMaskFromISR

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

 vSetMSP
 	msr msp, r0
 	bx lr

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

 xPortPendSVHandler:
 	mrs r0, psp

 	ldr	r3, =pxCurrentTCB	/* Get the location of the current TCB. */
 	ldr	r2, [r3]

 	subs r0, r0, #32		/* Make space for the remaining low registers. */
 	str r0, [r2]			/* Save the new top of stack. */
 	stmia r0!, {r4-r7}		/* Store the low registers that are not saved automatically. */
 	mov r4, r8				/* Store the high registers. */
 	mov r5, r9
 	mov r6, r10
 	mov r7, r11
 	stmia r0!, {r4-r7}

 	push {r3, r14}
 	cpsid i
 	bl vTaskSwitchContext
 	cpsie i
 	pop {r2, r3}			/* lr goes in r3. r2 now holds tcb pointer. */

 	ldr r1, [r2]
 	ldr r0, [r1]			/* The first item in pxCurrentTCB is the task top of stack. */
 	adds r0, r0, #16		/* Move to the high registers. */
 	ldmia r0!, {r4-r7}		/* Pop the high registers. */
 	mov r8, r4
 	mov r9, r5
 	mov r10, r6
 	mov r11, r7

 	msr psp, r0				/* Remember the new top of stack for the task. */

 	subs r0, r0, #32		/* Go back for the low registers that are not automatically restored. */
 	ldmia r0!, {r4-r7}		/* Pop low registers.  */

 	bx r3

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

 vPortSVCHandler;
 	/* This function is no longer used, but retained for backward
 	compatibility. */
 	bx lr

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

 vPortStartFirstTask
 	/* The MSP stack is not reset as, unlike on M3/4 parts, there is no vector
 	table offset register that can be used to locate the initial stack value.
 	Not all M0 parts have the application vector table at address 0. */

 	ldr	r3, =pxCurrentTCB	/* Obtain location of pxCurrentTCB. */
 	ldr r1, [r3]
 	ldr r0, [r1]			/* The first item in pxCurrentTCB is the task top of stack. */
 	adds r0, #32			/* Discard everything up to r0. */
 	msr psp, r0				/* This is now the new top of stack to use in the task. */
 	movs r0, #2				/* Switch to the psp stack. */
 	msr CONTROL, r0
 	pop {r0-r5}				/* Pop the registers that are saved automatically. */
 	mov lr, r5				/* lr is now in r5. */
 	cpsie i					/* The first task has its context and interrupts can be enabled. */
 	pop {pc}				/* Finally, pop the PC to jump to the user defined task code. */

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

 ulSetInterruptMaskFromISR
 	mrs r0, PRIMASK
 	cpsid i
 	bx lr

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

 vClearInterruptMaskFromISR
 	msr PRIMASK, r0
 	bx lr

 	END
	/*
	FreeRTOS V8.2.0rc1 - Copyright (C) 2014 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

	1 tab == 4 spaces!

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

	***************************************************************************
	* *
	* Investing in training allows your team to be as productive as *
	* possible as early as possible, lowering your overall development *
	* cost, and enabling you to bring a more robust product to market *
	* earlier than would otherwise be possible. Richard Barry is both *
	* the architect and key author of FreeRTOS, and so also the world's *
	* leading authority on what is the world's most popular real time *
	* kernel for deeply embedded MCU designs. Obtaining your training *
	* from Richard ensures your team will gain directly from his in-depth *
	* product knowledge and years of usage experience. Contact Real Time *
	* Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
	* by Richard Barry: http://www.FreeRTOS.org/contact
	* *
	***************************************************************************

	***************************************************************************
	* *
	* You are receiving this top quality software for free. Please play *
	* fair and reciprocate by reporting any suspected issues and *
	* participating in the community forum: *
	* http://www.FreeRTOS.org/support *
	* *
	* Thank you! *
	* *
	***************************************************************************

	http://www.FreeRTOS.org - Documentation, books, training, latest versions,
	license and Real Time Engineers Ltd. contact details.

	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 <FreeRTOSConfig.h>

	RSEG CODE:CODE(2)
	thumb

	EXTERN vPortYieldFromISR
	EXTERN pxCurrentTCB
	EXTERN vTaskSwitchContext

	PUBLIC vSetMSP
	PUBLIC xPortPendSVHandler
	PUBLIC vPortSVCHandler
	PUBLIC vPortStartFirstTask
	PUBLIC ulSetInterruptMaskFromISR
	PUBLIC vClearInterruptMaskFromISR

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

	vSetMSP
	msr msp, r0
	bx lr

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

	xPortPendSVHandler:
	mrs r0, psp

	ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */
	ldr r2, [r3]

	subs r0, r0, #32 /* Make space for the remaining low registers. */
	str r0, [r2] /* Save the new top of stack. */
	stmia r0!, {r4-r7} /* Store the low registers that are not saved automatically. */
	mov r4, r8 /* Store the high registers. */
	mov r5, r9
	mov r6, r10
	mov r7, r11
	stmia r0!, {r4-r7}

	push {r3, r14}
	cpsid i
	bl vTaskSwitchContext
	cpsie i
	pop {r2, r3} /* lr goes in r3. r2 now holds tcb pointer. */

	ldr r1, [r2]
	ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
	adds r0, r0, #16 /* Move to the high registers. */
	ldmia r0!, {r4-r7} /* Pop the high registers. */
	mov r8, r4
	mov r9, r5
	mov r10, r6
	mov r11, r7

	msr psp, r0 /* Remember the new top of stack for the task. */

	subs r0, r0, #32 /* Go back for the low registers that are not automatically restored. */
	ldmia r0!, {r4-r7} /* Pop low registers. */

	bx r3

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

	vPortSVCHandler;
	/* This function is no longer used, but retained for backward
	compatibility. */
	bx lr

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

	vPortStartFirstTask
	/* The MSP stack is not reset as, unlike on M3/4 parts, there is no vector
	table offset register that can be used to locate the initial stack value.
	Not all M0 parts have the application vector table at address 0. */

	ldr r3, =pxCurrentTCB /* Obtain location of pxCurrentTCB. */
	ldr r1, [r3]
	ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
	adds r0, #32 /* Discard everything up to r0. */
	msr psp, r0 /* This is now the new top of stack to use in the task. */
	movs r0, #2 /* Switch to the psp stack. */
	msr CONTROL, r0
	pop {r0-r5} /* Pop the registers that are saved automatically. */
	mov lr, r5 /* lr is now in r5. */
	cpsie i /* The first task has its context and interrupts can be enabled. */
	pop {pc} /* Finally, pop the PC to jump to the user defined task code. */

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

	ulSetInterruptMaskFromISR
	mrs r0, PRIMASK
	cpsid i
	bx lr

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

	vClearInterruptMaskFromISR
	msr PRIMASK, r0
	bx lr

	END