hard fault handler怎么定位错误

lovewubo

程序运行中出现了硬件错误，基本排除了任务堆栈太小的嫌疑，然后我上网查了一下如何定位错误，基本是这样说的：改写默认的hard_fault_handler处理函数，换成自己的，然后查看LR的地址，它表示了程序进入硬件错误中断前要执行的下一条指令，可我这样做了以后，得到了LR的地址，但是问题是，我怎么根据这个地址找到那条将要执行的语句？反汇编里面的地址跟这个地址的格式好像不一样啊。还是上图吧

我把默认的硬件错误中断函数改了：

void HardFault_Handler(void)

{ 

  __ASM("TST LR, #4");

  __ASM("ITE EQ");

  __ASM("MRSEQ R0, MSP");

  __ASM("MRSNE R0, PSP");

  __ASM("B hard_fault_handler_c");

}

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 ("\n\n[Hard fault handler - all numbers in hex]\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 [R14] = %x  subroutine call return address\n", stacked_lr);

  printf ("PC [R15] = %x  program counter\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))));

  printf ("SCB_SHCSR = %x\n", SCB->SHCSR);

 

  while (1);

}

lovewubo

我通过代码注释，定位到问题了。原来是在中断函数里面加入了一句延时函数。为什么这样会导致出错？

xiaoyan

帮顶

正点原子

有可能是字节对齐的问题.

lovewubo

回复【4楼】正点原子:
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怎么讲？原子大神。字节对齐和中断有什么关系？

正点原子

回复【5楼】lovewubo:
---------------------------------
没有直接关系