init.s

来自「各种硬件平台上的us OS移植实例(arm6)」· S 代码 · 共 41 行

    	TTL 	ARM uC/OS minimal run-time system > init.s
    	; ---------------------------------------------------------------------
    	; This file provides a VERY simple (minimal) run-time support
    	; for 'C' programs.
    	;
    	; $Revision: 0.1 $
    	;   $Author: jsmith $
    	;     $Date: 941103 $
    	;
    	; Copyright (c) 1994, VLSI Technology Inc. All Rights Reserved.
    	; ---------------------------------------------------------------------

    	INCLUDE	swis_h.s

    	; ---------------------------------------------------------------------

	IMPORT	main	    ; user application entry point
	EXPORT	__main	    ; standard name for 'C' entry point on the ARM

    	; ---------------------------------------------------------------------

	AREA	|uCOS_init|,CODE,READONLY
	ENTRY
__main 	; We provide *NO* argument support for the "main" function we
    	; are about to call.
    	;
    	; At the moment we have a hard-wired "top of memory" stack
    	; pointer.
    	SWI 	GetEnv	    	; read environment information
    	MOV 	sp,a2	    	; RAM size is returned in "a2"
    	; This then becomes the stack pointer for the initial
    	; application thread.
    	;
	; As long as "main" is an APCS-3 conforming function, it will
	; not expect any arguments in "v1", and it will happily return
	; using its entry "lr". This saves a couple of instructions.
	B	main		; extern int main(void) ;

    	; ---------------------------------------------------------------------
	END 	; EOF init.s