init.s

英培特嵌入式开发系统IDE软件包

#*********************************************************************************************
# File：	init.s																			 *
# Author:	embest																			 *
# Desc：	C start up codes.Configure memory, Initialize ISR ,stacks,						 *
#           initialize C-variables															 *
#           Fill zeros into zero-initialized C-variables									 *
# History:																					 *
#*********************************************************************************************

/*------------------------------------------------------------------------------------------*/
/*	 								global symbol define						 		    */
/*------------------------------------------------------------------------------------------*/
	.global	_start
	.global	__gccmain
	
/*------------------------------------------------------------------------------------------*/
/*	 								code								 				    */
/*------------------------------------------------------------------------------------------*/
	.text
_start:
# Set interrupt / exception vectors
	b       Reset_Handler 
Undefined_Handler:
	b       Undefined_Handler
SWI_Handler:
	b       SWI_Handler
Prefetch_Handler:
	b       Prefetch_Handler
Abort_Handler:
	b       Abort_Handler                                                                    
	nop						                 /* Reserved vector */
IRQ_Handler:
	b       IRQ_Handler
FIQ_Handler:
	b       FIQ_Handler
	    
Reset_Handler:
	ldr	sp, =0x00002000

# *****************************************************************************
# Branch on C code Main function (with interworking)						  *
# Branch must be performed by an interworking call as either an ARM or Thumb  *
# main C function must be supported. This makes the code not position-		  *
# independant. A Branch with link would generate errors						  *
# *****************************************************************************

	.extern     Main

	ldr         r0, = Main
	mov         lr, pc
	bx          r0
# *****************************************************************************
# Loop for ever                                                               *           
# End of application. Normally, never occur.								  *
# Could jump on Software Reset ( B 0x0 ).									  *
# *****************************************************************************
End:
	b           End

__gccmain:
	mov     	pc, lr   
	
	.end