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