定位ARM Hard Fault 的方法

vipjph

1，
用Keil的话，可以做如下操作：

先将fault中断函数的内容改为:




HardFault_Handler\


PROC


;EXPORT
HardFault_Handler
[WEAK]


;B
.


IMPORT hard_fault_handler_c



TST LR, #4



ITE EQ



MRSEQ R0, MSP



MRSNE R0, PSP



B hard_fault_handler_c




ENDP







然后在源程序里添加下面的函数代码:

// hard fault handler in C,


// with stack frame location as input parameter


void hard_fault_handler_c(unsigned int * hardfault_args)


{


unsigned int stacked_r0;


unsigned int stacked_r1;


unsigned int stacked_r2;


unsigned int stacked_r3;


unsigned int stacked_r12;


unsigned int stacked_lr;


unsigned int stacked_pc;


unsigned int stacked_psr;





stacked_r0 = ((unsigned long) hardfault_args[0]);


stacked_r1 = ((unsigned long) hardfault_args[1]);


stacked_r2 = ((unsigned long) hardfault_args[2]);


stacked_r3 = ((unsigned long) hardfault_args[3]);





stacked_r12 = ((unsigned long) hardfault_args[4]);


stacked_lr = ((unsigned long) hardfault_args[5]);


stacked_pc = ((unsigned long) hardfault_args[6]);


stacked_psr = ((unsigned long) hardfault_args[7]);





printf ("[Hard fault handler]\n");


printf ("R0 = %x\n", stacked_r0);


printf ("R1 = %x\n", stacked_r1);


printf ("R2 = %x\n", stacked_r2);


printf ("R3 = %x\n", stacked_r3);


printf ("R12 = %x\n", stacked_r12);


printf ("LR = %x\n", stacked_lr);


printf ("PC = %x\n", stacked_pc);


printf ("PSR = %x\n", stacked_psr);


printf ("BFAR = %x\n", (*((volatile unsigned long *)(0xE000ED38))));


printf ("CFSR = %x\n", (*((volatile unsigned long *)(0xE000ED28))));


printf ("HFSR = %x\n", (*((volatile unsigned long *)(0xE000ED2C))));


printf ("DFSR = %x\n", (*((volatile unsigned long *)(0xE000ED30))));


printf ("AFSR = %x\n", (*((volatile unsigned long *)(0xE000ED3C))));








while(1)

{


;;

}




}





如果使用调试器,则可以在第一个printf处设置断点.没有的话看串口打印结果


通过查看stacked_lr的内容可以知道程序运行到哪个位置出现fault

然后查看编译后汇编代码,可以知道源程序是哪个函数哪一步出现问题,

配合其它寄存器的内容来分析找出原因







2．
用IAR的话，
把startup_ewarm.c文件中的FaultISR（）函数的内容改为：

volatile unsigned int stacked_r0;


volatile unsigned int stacked_r1;


volatile unsigned int stacked_r2;


volatile unsigned int stacked_r3;


volatile unsigned int stacked_r12;


volatile unsigned int stacked_lr;


volatile unsigned int stacked_pc;


volatile unsigned int stacked_psr;





//unsigned long cc;




stacked_r0 = ((unsigned long) hardfault_args[0]);


stacked_r1 = ((unsigned long) hardfault_args[1]);


stacked_r2 = ((unsigned long) hardfault_args[2]);


stacked_r3 = ((unsigned long) hardfault_args[3]);





stacked_r12 = ((unsigned long) hardfault_args[4]);


stacked_lr = ((unsigned long) hardfault_args[5]);


stacked_pc = ((unsigned long) hardfault_args[6]);


stacked_psr = ((unsigned long) hardfault_args[7]);











printf ("[Hard fault handler]\n");


printf ("R0 = %x\n", stacked_r0);


printf ("R1 = %x\n", stacked_r1);


printf ("R2 = %x\n", stacked_r2);


printf ("R3 = %x\n", stacked_r3);


printf ("R12 = %x\n", stacked_r12);


printf ("LR = %x\n", stacked_lr);


printf ("PC = %x\n", stacked_pc);


printf ("PSR = %x\n", stacked_psr);


printf ("BFAR = %x\n", (*((volatile unsigned long *)(0xE000ED38))));


printf ("CFSR = %x\n", (*((volatile unsigned long *)(0xE000ED28))));


printf ("HFSR = %x\n", (*((volatile unsigned long *)(0xE000ED2C))));


printf ("DFSR = %x\n", (*((volatile unsigned long *)(0xE000ED30))));


printf ("AFSR = %x\n", (*((volatile unsigned long *)(0xE000ED3C))));









while(1)


{


;;


}

如果使用调试器,则可以在第一个printf处设置断点.没有的话看串口打印结果


通过查看stacked_lr的内容可以知道程序运行到哪个位置出现fault

然后查看编译后汇编代码,可以知道源程序是哪个函数哪一步出现问题,

配合其它寄存器的内容来分析找出原因

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