ARM异常---一个DataAbort的触发过程：

一个DataAbort异常的触发过程：
///////////////////////////
///xxxx.inc
_STACK_BASEADDRESS EQU 0x33ff8000
_MMUTT_STARTADDRESS EQU 0x33ff8000
_ISR_STARTADDRESS EQU 0x33ffff00

///xxx.s
         MACRO
$HandlerLabel HANDLER $HandleLabel

$HandlerLabel
   sub   sp,sp,#4   ;decrement sp(to store jump address)
   stmfd   sp!,{r0}   ;PUSH the work register to stack(lr does t push because it return to original address)
   ldr     r0,=$HandleLabel;load the address of HandleXXX to r0
   ldr     r0,[r0]   ;load the contents(service routine start address) of HandleXXX
   str     r0,[sp,#4]      ;store the contents(ISR) of HandleXXX to stack
   ldmfd   sp!,{r0,pc}     ;POP the work register and pc(jump to ISR)
   MEND

HandlerPabort HANDLER HandlePabort

HandlerPabort HANDLER HandlePabort 展开:
{
HandlerPabort
    sub sp,sp,#4　　　　　　　;decrement sp(to store jump address)
    stmfd sp!,{r0}　　　　　　;PUSH the work register to stack(lr does''t push because it return to original address)

    ldr r0,=$HandlePabort　　;load the address of HandleXXX to r0
    ldr r0,[r0]　　　　　　　　;load the contents(service routine start address) of Handler function

    str r0,[sp,#4]　　　　　　;store the contents(ISR) of HandleXXX to stack
    ldmfd sp!,{r0,pc}　　　　;POP the work register and pc(jump to ISR)
}

///xxx.s
/* ^ 其实就是 MAP ，这段程序的意思是，从 _ISR_STARTADDRESS
开始，预留一个变量，每个变量一个标号，预留的空间为 4个字节，也就是 32BIT
，其实这里放的是真正的C写的处理函数的地址，说白了，就是函数指针*/
^ _ISR_STARTADDRESS ; _ISR_STARTADDRESS=0x33FF_FF00
HandleReset # 4
HandleUndef # 4
HandleSWI # 4
HandlePabort # 4
HandleDabort # 4
HandleReserved # 4
HandleIRQ # 4
HandleFIQ # 4

///////////////////////////
xxxx.c
#define _ISR_STARTADDRESS 0x33ffff00
#define pISR_PABORT (*(unsigned *)(_ISR_STARTADDRESS+0xc))
pISR_PABORT=(unsigned)HaltPabort; //给PABORT中断入口函数指针赋值。
【 *PABORTFUNC = HaltPabort 】
/////////////////////

中断触发时：
1 -- ldr r0,=HandlePabort
2 -- (*(unsigned *)HandlePabort）即是pISR_PABORT
3 -- pISR_PABORT 即是异常处理函数HaltPabort
4 -- POP 出栈时弹出的是HandlePabort 到PC