HardFault_Handler 输出日志信息

之前文章说了原理，这里把最终实现的代码总结：

IAR

 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[]);
   stacked_r1 = ((unsigned long) hardfault_args[]);
   stacked_r2 = ((unsigned long) hardfault_args[]);
   stacked_r3 = ((unsigned long) hardfault_args[]);

   stacked_r12 = ((unsigned long) hardfault_args[]);
   stacked_lr = ((unsigned long) hardfault_args[]);
   stacked_pc = ((unsigned long) hardfault_args[]);
   stacked_psr = ((unsigned long) hardfault_args[]);

   printf ("\r\n[Hard fault handler - all numbers in hex]\r\n");
   printf ("R0=%x\r\n",stacked_r0);
   printf ("R1=%x\r\n",stacked_r1);
   printf ("R2=%x\r\n",stacked_r2);
   printf ("R3=%x\r\n",stacked_r3);
   printf ("R12=%x\r\n",stacked_r12);
   printf ("LR[R14]=%x subroutine call return address\r\n",stacked_lr);
   printf ("PC[R15]=%x program counter\r\n",stacked_pc);
   printf ("PSR=%x\r\n",stacked_psr);
   printf ("BFAR=%x\r\n",(*((volatile unsigned long *)(0xE000ED38))));
   printf ("CFSR=%x\r\n",(*((volatile unsigned long *)(0xE000ED28))));
   printf ("HFSR=%x\r\n",(*((volatile unsigned long *)(0xE000ED2C))));
   printf ("DFSR=%x\r\n",(*((volatile unsigned long *)(0xE000ED30))));
   printf ("AFSR=%x\r\n",(*((volatile unsigned long *)(0xE000ED3C))));
   printf ("SCB_SHCSR=%x\r\n", SCB->SHCSR);

   while ();
 }

hard_fault_handler_c

 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");
 }

HardFault_Handler

这里的HardFault_Handler里是内联汇编

MDK不能使用内联汇编

 __ASM void HardFault_Handler(void)
 {
       TST lr, #     // Test for MSP or PSP
       ITE EQ
       MRSEQ r0, MSP
       MRSNE r0, PSP
       IMPORT HardFault_Handler_C
       B HardFault_Handler_C
 }

HardFault_Handler

 void HardFault_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[]);
   stacked_r1 = ((unsigned long) hardfault_args[]);
   stacked_r2 = ((unsigned long) hardfault_args[]);
   stacked_r3 = ((unsigned long) hardfault_args[]);

   stacked_r12 = ((unsigned long) hardfault_args[]);
   stacked_lr = ((unsigned long) hardfault_args[]);
   stacked_pc = ((unsigned long) hardfault_args[]);
   stacked_psr = ((unsigned long) hardfault_args[]);

   printf ("\n\n[Hard fault handler - all numbers in hex]\r\n");
   printf ("R0 = %x\r\n", stacked_r0);
   printf ("R1 = %x\r\n", stacked_r1);
   printf ("R2 = %x\r\n", stacked_r2);
   printf ("R3 = %x\r\n", stacked_r3);
   printf ("R12 = %x\r\n", stacked_r12);
   printf ("LR [R14] = %x  subroutine call return address\r\n", stacked_lr);
   printf ("PC [R15] = %x  program counter\r\n", stacked_pc);
   printf ("PSR = %x\r\n", stacked_psr);
   printf ("BFAR = %x\r\n", (*((volatile unsigned long *)(0xE000ED38))));
   printf ("CFSR = %x\r\n", (*((volatile unsigned long *)(0xE000ED28))));
   printf ("HFSR = %x\r\n", (*((volatile unsigned long *)(0xE000ED2C))));
   printf ("DFSR = %x\r\n", (*((volatile unsigned long *)(0xE000ED30))));
   printf ("AFSR = %x\r\n", (*((volatile unsigned long *)(0xE000ED3C))));
   printf ("SCB_SHCSR = %x\r\n", SCB->SHCSR);

   while ();
 } 

HardFault_Handler_C

 [Hard fault handler - all numbers in hex]
 R0 =
 R1 =
 R2 =
 R3 = c0
 R12 =
 LR [R14] =   subroutine call return address
 PC [R15] =   program counter
 PSR =
 BFAR =
 CFSR =
 HFSR =
 DFSR =
 AFSR =
 SCB_SHCSR = 

对于调试很有帮助的，注意PC[R15]的数值是我们需要的