www.pudn.com > S3C44B0X_USB.rar > vector.s

ModeMask 		EQU	0x1F 
SVC32Mode		EQU	0x13 
IRQ32Mode		EQU	0x12 
FIQ32Mode		EQU	0x11 
User32Mode		EQU	0x10 
Abort32Mode		EQU	0x17 
Undef32Mode		EQU	0x1B 
IRQ_BIT			EQU	0x80 
FIQ_BIT			EQU	0x40 
 
	GBLS	MainEntry 
MainEntry	SETS	"main" 
	IMPORT	$MainEntry 
 
;********************************************************** 
;检查是否使用tasm.exe进行编译 
	 
 GBLL    THUMBCODE 
    [ {CONFIG} = 16	 
THUMBCODE SETL	{TRUE} 
    CODE32 
    |    
THUMBCODE SETL	{FALSE} 
    ] 
 
    [ THUMBCODE 
    CODE32   ;for start-up code for Thumb mode 
    ]     
 	     
;****************************************************** 
	AREA	SelfBoot,	CODE,	READONLY 
	 
	IMPORT	UDF_INS_VECTOR 
	IMPORT	SWI_SVC_VECTOR 
	IMPORT	INS_ABT_VECTOR 
	IMPORT	DAT_ABT_VECTOR 
	IMPORT	IRQ_SVC_VECTOR 
	IMPORT	FIQ_SVC_VECTOR				 
	 
	ENTRY	 
	IF :DEF: |ads$version| 
	ELSE 
	EXPORT	__main 
__main 
	ENDIF		 
ResetEntry 
	b	SYS_RST_HANDLER 
	b	UDF_INS_HANDLER 
	b	SWI_SVC_HANDLER 
	b	INS_ABT_HANDLER 
	b	DAT_ABT_HANDLER 
	b	. 
	b	IRQ_SVC_HANDLER 
	b	FIQ_SVC_HANDLER 
 
;****************************************************** 
	MACRO	 
$Label	HANDLER	$Vector 
$Label 
	sub	lr, lr, #4			 
	stmfd	sp!, {r0-r3, lr}	 
	ldr	r0, =$Vector 
	ldr	pc, [r0] 
	ldmfd	sp!, {r0-r3, pc}^		 
	MEND 
	 
UDF_INS_HANDLER 
	stmfd	sp!, {r0-r3, lr} 
	ldr	r0, =UDF_INS_VECTOR 
	mov	lr, pc 
	ldr	pc, [r0] 
	ldmfd	sp!, {r0-r3, pc}^ 
SWI_SVC_HANDLER 
	stmfd	sp!, {r0-r3, lr} 
	ldr	r0, =SWI_SVC_VECTOR 
	mov	lr, pc 
	ldr	pc, [r0] 
	ldmfd	sp!, {r0-r3, pc}^ 
INS_ABT_HANDLER 
	sub	lr, lr, #4 
	stmfd	sp!, {r0-r3, lr} 
	ldr	r0, =INS_ABT_VECTOR 
	mov	lr, pc 
	ldr	pc, [r0] 
	ldmfd	sp!, {r0-r3, pc}^ 
DAT_ABT_HANDLER 
	sub	lr, lr, #4 
	stmfd	sp!, {r0-r3, lr} 
	ldr	r0, =DAT_ABT_VECTOR 
	mov	lr, pc 
	ldr	pc, [r0] 
	ldmfd	sp!, {r0-r3, pc}^ 
IRQ_SVC_HANDLER 
	sub	lr, lr, #4 
	stmfd	sp!, {r0-r12, lr}	 
	mrs	r0, spsr 
	stmfd	sp!, {r0} 
	ldr	r0, =IRQ_SVC_VECTOR 
	ldr	pc, [r0]	 
FIQ_SVC_HANDLER 
	sub	lr, lr, #4 
	stmfd	sp!, {r0-r12, lr}	 
	mrs	r0, spsr 
	stmfd	sp!, {r0} 
	ldr	r0, =IRQ_SVC_VECTOR 
	ldr	pc, [r0] 
				 
;******************************************************* 
SYS_RST_HANDLER 
	mrs	r0, cpsr				;enter svc mode and disable irq,fiq 
	bic	r0, r0, #ModeMask 
	orr	r0, r0, #(SVC32Mode :OR: IRQ_BIT :OR: FIQ_BIT) 
	msr	cpsr_c, r0 
	 
	IMPORT	InitSystem 
	bl	InitSystem	 
	 
	adr	r0, ResetEntry 
	ldr	r1,	BaseOfROM 
	cmp	r0,	r1 
	ldreq	r0, TopOfROM 
	beq	InitRamData 
			 
	ldr	r2,	=CopyProcBeg 
	sub	r1, r2, r1 
	add	r0, r0, r1	 
	ldr	r3,	=CopyProcEnd	 
0	 
	ldmia	r0!, {r4-r7} 
	stmia	r2!, {r4-r7} 
	cmp	r2, r3 
	bcc	%B0	 
	 
	ldr	r3, TopOfROM		 
	ldr	pc, =CopyProcBeg 
	 
;*********************************************** 
CopyProcBeg	 
0	 
	ldmia	r0!, {r4-r11} 
	stmia	r2!, {r4-r11} 
	cmp	r2, r3 
	bcc	%B0	 
CopyProcEnd 
	 
	sub	r1, r2, r3 
	sub	r0, r0, r1		 
	 
InitRamData	 
	ldr	r2, BaseOfBSS 
	ldr	r3, BaseOfZero	 
0 
	cmp	r2, r3 
	ldrcc	r1, [r0], #4 
	strcc	r1, [r2], #4 
	bcc	%B0	 
 
	mov	r0,	#0 
	ldr	r3,	EndOfBSS 
1	 
	cmp	r2,	r3 
	strcc	r0, [r2], #4 
	bcc	%B1			 
		 		 		 
	ldr	pc,	GotoMain	 
 
GotoMain	DCD	$MainEntry 
 
;*********************************************** 
	IMPORT	|Image$$RO$$Base|	; ROM code start	 
	IMPORT	|Image$$RO$$Limit|	; RAM data starts after ROM program 
	IMPORT	|Image$$RW$$Base|	; Pre-initialised variables 
	IMPORT	|Image$$ZI$$Base|	; uninitialised variables 
	IMPORT	|Image$$ZI$$Limit|	; End of variable RAM space 
 
 
BaseOfROM	DCD	|Image$$RO$$Base| 
TopOfROM	DCD	|Image$$RO$$Limit| 
BaseOfBSS	DCD	|Image$$RW$$Base| 
BaseOfZero	DCD	|Image$$ZI$$Base| 
EndOfBSS	DCD	|Image$$ZI$$Limit| 
 
	EXPORT	GetBaseOfROM 
	EXPORT	GetEndOfROM 
	EXPORT	GetBaseOfBSS 
	EXPORT	GetBaseOfZero 
	EXPORT	GetEndOfBSS 
	 
GetBaseOfROM 
	ldr	r0, BaseOfROM 
	mov	pc, lr	 
GetEndOfROM 
	ldr	r0, TopOfROM 
	mov	pc,	lr 
GetBaseOfBSS 
	ldr	r0,	BaseOfBSS 
	mov	pc,	lr 
GetBaseOfZero 
	ldr	r0,	BaseOfZero 
	mov	pc,	lr 
GetEndOfBSS 
	ldr	r0,	EndOfBSS 
	mov	pc,	lr 
	 
;***********************************************	 
	 
	END