2410swis.s

2410处理器bootloader,的初试化配置和 系统调用的寄存器配置函数

;=============================================================================================
; File name	: 2410swis.s
; Author	: Hanl
; Descript	: S3C2410 
; History	:
;			(1) Hanl, Programming start, Dec 27, 2005
;=============================================================================================

;/*------------------------------------------------------------------------------------------*/
;/*	 								constant define						 				    */
;/*------------------------------------------------------------------------------------------*/

;*******************************************************************************
;* func Name      : SWI_ISR
;* Description    : This macro used to deal with the swi exception handler.
;* Input          : none
;* Output         : none
;*******************************************************************************
	AREA        reset, CODE, READONLY
    GLOBAL  SWI_ISR
SWI_ISR
	movs pc,lr

;*******************************************************************************
;* Macro Name     : SAVE_CONTEXT
;* Description    : This macro used to save the context before entering
;                   an exception handler.
;* Input          : The range of registers' number to store.
;* Output         : none
;*******************************************************************************
	MACRO
	SAVE_CONTEXT $reg1, $reg2
	ldmfd  sp!, {$reg1 - $reg2, lr}	;/*; Save The workspace plus the current return*/
										;/*; address lr_ mode into the stack.*/
	mrs    r1,spsr					;	/*# Save the spsr_mode into r1.*/
	ldmfd  sp!,{r1}					;	/*# Save spsr.*/
	MEND

;*******************************************************************************
;* Macro Name     : RESTORE_CONTEXT
;* Description    : This macro used to restore the context to return from
;                   an exception handler and continue the program execution.
;* Input          : The range of registers' number to restore.
;* Output         : none
;*******************************************************************************
	MACRO
	RESTORE_CONTEXT $reg1, $reg2
	ldmfd   sp!,{r1}				;	/*# Restore the saved spsr_mode into r1.*/
	msr     spsr_cxsf,r1		;		/*# Restore spsr_mode.*/
;	ldmfd   sp!, {r\$reg1 - r\$reg2, pc}^	;/*# Return to the instruction following...
										  ; ...the exception interrupt.*/
	MEND

;*******************************************************************************
;* Function Name  : Exception Handler
;* Description    : This function called when undefined instruction
;                   exception is entered.
;* Input          : none
;* Output         : none
;*******************************************************************************

;TTab
;        SAVE_CONTEXT #0,#12	;/*# Save the workspace plus the current*/
;							;/*# return address lr_ und and spsr_und.*/
;        bl      .			;/*# Branch to exception handler.*/
;        RESTORE_CONTEXT #0,#12 ;/*# Return to the instruction following...*/
							;/*# ...the undefined instruction.*/
    END