portmacro.inc

FreeRTOS - V5.1.1 Last Update: Nov 20 2008 http://sourceforge.net/projects/freertos/

;/*
;	FreeRTOS.org V5.1.1 - Copyright (C) 2003-2008 Richard Barry.
;
;	This file is part of the FreeRTOS.org distribution.
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	IMPORT  ulCriticalNesting		;
	IMPORT	pxCurrentTCB			;


	MACRO
	portRESTORE_CONTEXT


	LDR		R0, =pxCurrentTCB		; Set the LR to the task stack.  The location was...
	LDR		R0, [R0]				; ... stored in pxCurrentTCB
	LDR		LR, [R0]

	LDR		R0, =ulCriticalNesting	; The critical nesting depth is the first item on... 
	LDMFD	LR!, {R1}				; ...the stack.  Load it into the ulCriticalNesting var.
	STR		R1, [R0]				;

	LDMFD	LR!, {R0}				; Get the SPSR from the stack.
	MSR		SPSR_cxsf, R0			;

	LDMFD	LR, {R0-R14}^			; Restore all system mode registers for the task.
	NOP								;

	LDR		LR, [LR, #+60]			; Restore the return address

									; And return - correcting the offset in the LR to obtain ...
	SUBS	PC, LR, #4				; ...the correct address.

	MEND

; /**********************************************************************/

	MACRO
	portSAVE_CONTEXT


	STMDB 	SP!, {R0}				; Store R0 first as we need to use it.

	STMDB	SP,{SP}^				; Set R0 to point to the task stack pointer.
	NOP								;
	SUB		SP, SP, #4				;
	LDMIA	SP!,{R0}				;

	STMDB	R0!, {LR}				; Push the return address onto the stack.
	MOV		LR, R0					; Now we have saved LR we can use it instead of R0.
	LDMIA	SP!, {R0}				; Pop R0 so we can save it onto the system mode stack.

	STMDB	LR,{R0-LR}^				; Push all the system mode registers onto the task stack.
	NOP								;
	SUB		LR, LR, #60				;

	MRS		R0, SPSR				; Push the SPSR onto the task stack.
	STMDB	LR!, {R0}				;

	LDR		R0, =ulCriticalNesting	;
	LDR		R0, [R0]				;
	STMDB	LR!, {R0}				;

	LDR		R0, =pxCurrentTCB		; Store the new top of stack for the task.
	LDR		R1, [R0]				; 		 
	STR		LR, [R1]				;
	
	MEND
	
	END