ARM（920T）異常和中斷映射過程

因此有七個向量，向量表如下：

1.跳轉(zhuǎn)

Reset
bHandlerReset ;處理器默認運行模式是 中斷向量0x00000000

bHandlerUndef 中斷向量為0x00000004
bHandlerSWI中斷向量為0x00000008
bHandlerPabort中斷向量為0x0000000c
bHandlerDabort中斷向量為0x00000010
b. ;.表示當(dāng)前地址，表示當(dāng)前地址死循環(huán) 0x00000014保留
bHandlerIRQ 中斷向量為0x00000018
bHandlerFIQ 中斷向量為0x0000001c

CPU內(nèi)核默認的中斷向量（VA）如上，如果當(dāng)前未開啟MMU地址重映射，則PA的中斷向量也為上面所述。

2.第一次映射

LTORG
HandlerFIQ HANDLER HandleFIQ
HandlerIRQ HANDLER HandleIRQ
HandlerUndef HANDLER HandleUndef
HandlerSWI HANDLER HandleSWI
HandlerDabort HANDLER HandleDabort
HandlerPabort HANDLER HandlePabort

宏定義如下：

MACRO
$HandlerLabelHANDLER$HandleLabel;

$HandlerLabel
subsp,sp,#4;空出一個字
stmfdsp!,{r0};將R0入堆棧，此時的R0存在的數(shù)據(jù)是前一個模式所遺留的，必須加以保存
ldrr0,=$HandleLabel;RAM中的中斷向量表

ldrr0,[r0] ;取此中斷第一個字里面的內(nèi)容
strr0,[sp,#4];先將SP指針加4個字節(jié)，后把R0存入,不更新sp
ldmfdsp!,{r0,pc};進行跳轉(zhuǎn)
MEND

如果是IRQ中斷則進入下列子程序進行IRQ子中斷辨別

ldrr0,=HandleIRQ;判斷是哪個IRQ的子程序，建立IRQ中斷在內(nèi)存指針的重映射
ldrr1,=IRQ_SEV
strr1,[r0]

IRQ_SEV;子中斷判斷并跳轉(zhuǎn)
subsp,sp,#4
stmfdsp!,{r8-r9}
ldrr9,=INTOFFSET

ldrr9,[r9]
ldrr8,=HandleEINT0
addr8,r8,r9,lsl #2
ldrr8,[r8]
strr8,[sp,#8]
ldmfdsp!,{r8-r9,pc}

內(nèi)存中定義一個中斷地址表存放中斷服務(wù)程序的起始地址(在高級語言中指定)

ALIGN
AREARWDATA,DATA,READWRITE
MAP_ISR_STARTADDRESS
HandleReset# 4 ;#--Field：定義一個結(jié)構(gòu)化內(nèi)存表中的數(shù)據(jù)域，該域為4個字節(jié)（32bit）
HandleUndef # 4
HandleSWI # 4
HandlePabort # 4
HandleDabort # 4
HandleReserved # 4
HandleIRQ # 4
HandleFIQ # 4
;以下是IRQ的子中斷
HandleEINT0 # 4
HandleEINT1 # 4
HandleEINT2 # 4
HandleEINT3 # 4
HandleEINT4_7# 4
HandleEINT8_23# 4
HandleRSV6# 4
HandleBATFLT # 4
HandleTICK # 4
HandleWDT# 4
HandleTIMER0 # 4
HandleTIMER1 # 4
HandleTIMER2 # 4
HandleTIMER3 # 4
HandleTIMER4 # 4
HandleUART2 # 4
HandleLCD # 4
HandleDMA0# 4
HandleDMA1# 4
HandleDMA2# 4
HandleDMA3# 4
HandleMMC# 4
HandleSPI0# 4
HandleUART1# 4
HandleRSV24# 4
HandleUSBD# 4
HandleUSBH# 4
HandleIIC # 4
HandleUART0 # 4
HandleSPI1 # 4
HandleRTC # 4
HandleADC # 4
END

3.第二次映射（將中斷服務(wù)子程序地址放入內(nèi)存中的中斷地址表）

#define pISR_RESET (*(unsigned *)(_ISR_STARTADDRESS+0x0))
#define pISR_UNDEF (*(unsigned *)(_ISR_STARTADDRESS+0x4))
#define pISR_SWI (*(unsigned *)(_ISR_STARTADDRESS+0x8))
#define pISR_PABORT (*(unsigned *)(_ISR_STARTADDRESS+0xc))
#define pISR_DABORT (*(unsigned *)(_ISR_STARTADDRESS+0x10))
#define pISR_RESERVED (*(unsigned *)(_ISR_STARTADDRESS+0x14))
#define pISR_IRQ (*(unsigned *)(_ISR_STARTADDRESS+0x18))
#define pISR_FIQ (*(unsigned *)(_ISR_STARTADDRESS+0x1c))

#define pISR_EINT0 (*(unsigned *)(_ISR_STARTADDRESS+0x20))
#define pISR_EINT1 (*(unsigned *)(_ISR_STARTADDRESS+0x24))
#define pISR_EINT2 (*(unsigned *)(_ISR_STARTADDRESS+0x28))
#define pISR_EINT3 (*(unsigned *)(_ISR_STARTADDRESS+0x2c))
#define pISR_EINT4_7 (*(unsigned *)(_ISR_STARTADDRESS+0x30))
#define pISR_EINT8_23 (*(unsigned *)(_ISR_STARTADDRESS+0x34))
#define pISR_NOTUSED6 (*(unsigned *)(_ISR_STARTADDRESS+0x38))
#define pISR_BAT_FLT (*(unsigned *)(_ISR_STARTADDRESS+0x3c))
#define pISR_TICK (*(unsigned *)(_ISR_STARTADDRESS+0x40))
#define pISR_WDT (*(unsigned *)(_ISR_STARTADDRESS+0x44))
#define pISR_TIMER0 (*(unsigned *)(_ISR_STARTADDRESS+0x48))
#define pISR_TIMER1 (*(unsigned *)(_ISR_STARTADDRESS+0x4c))
#define pISR_TIMER2 (*(unsigned *)(_ISR_STARTADDRESS+0x50))
#define pISR_TIMER3 (*(unsigned *)(_ISR_STARTADDRESS+0x54))
#define pISR_TIMER4 (*(unsigned *)(_ISR_STARTADDRESS+0x58))
#define pISR_UART2 (*(unsigned *)(_ISR_STARTADDRESS+0x5c))
#define pISR_LCD (*(unsigned *)(_ISR_STARTADDRESS+0x60))
#define pISR_DMA0 (*(unsigned *)(_ISR_STARTADDRESS+0x64))
#define pISR_DMA1 (*(unsigned *)(_ISR_STARTADDRESS+0x68))
#define pISR_DMA2 (*(unsigned *)(_ISR_STARTADDRESS+0x6c))
#define pISR_DMA3 (*(unsigned *)(_ISR_STARTADDRESS+0x70))
#define pISR_SDI (*(unsigned *)(_ISR_STARTADDRESS+0x74))
#define pISR_SPI0 (*(unsigned *)(_ISR_STARTADDRESS+0x78))
#define pISR_UART1 (*(unsigned *)(_ISR_STARTADDRESS+0x7c))
#define pISR_NOTUSED24 (*(unsigned *)(_ISR_STARTADDRESS+0x80))
#define pISR_USBD (*(unsigned *)(_ISR_STARTADDRESS+0x84))
#define pISR_USBH (*(unsigned *)(_ISR_STARTADDRESS+0x88))
#define pISR_IIC (*(unsigned *)(_ISR_STARTADDRESS+0x8c))
#define pISR_UART0 (*(unsigned *)(_ISR_STARTADDRESS+0x90))
#define pISR_SPI1 (*(unsigned *)(_ISR_STARTADDRESS+0x94))
#define pISR_RTC (*(unsigned *)(_ISR_STARTADDRESS+0x98))
#define pISR_ADC (*(unsigned *)(_ISR_STARTADDRESS+0x9c))

pISR_UNDEF = (unsigned)HaltUndef; //將中斷處理程序入口地址放入中斷變量地址所指向的內(nèi)存空間
pISR_SWI = (unsigned)HaltSwi; //往中斷地址表中填入中斷服務(wù)子程序地址
pISR_PABORT = (unsigned)HaltPabort;
pISR_DABORT = (unsigned)HaltDabort;

pISR_EINT1 = (unsigned)Eint1Int;