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

 1 void hard_fault_handler_c (unsigned int * hardfault_args)
 2 {
 3   unsigned int stacked_r0;
 4   unsigned int stacked_r1;
 5   unsigned int stacked_r2;
 6   unsigned int stacked_r3;
 7   unsigned int stacked_r12;
 8   unsigned int stacked_lr;
 9   unsigned int stacked_pc;
10   unsigned int stacked_psr;
11 
12   stacked_r0 = ((unsigned long) hardfault_args[0]);
13   stacked_r1 = ((unsigned long) hardfault_args[1]);
14   stacked_r2 = ((unsigned long) hardfault_args[2]);
15   stacked_r3 = ((unsigned long) hardfault_args[3]);
16  
17   stacked_r12 = ((unsigned long) hardfault_args[4]);
18   stacked_lr = ((unsigned long) hardfault_args[5]);
19   stacked_pc = ((unsigned long) hardfault_args[6]);
20   stacked_psr = ((unsigned long) hardfault_args[7]);
21  
22   printf ("
[Hard fault handler - all numbers in hex]
");
23   printf ("R0=%x
",stacked_r0);
24   printf ("R1=%x
",stacked_r1);
25   printf ("R2=%x
",stacked_r2);
26   printf ("R3=%x
",stacked_r3);
27   printf ("R12=%x
",stacked_r12);
28   printf ("LR[R14]=%x subroutine call return address
",stacked_lr);
29   printf ("PC[R15]=%x program counter
",stacked_pc);
30   printf ("PSR=%x
",stacked_psr);
31   printf ("BFAR=%x
",(*((volatile unsigned long *)(0xE000ED38))));
32   printf ("CFSR=%x
",(*((volatile unsigned long *)(0xE000ED28))));
33   printf ("HFSR=%x
",(*((volatile unsigned long *)(0xE000ED2C))));
34   printf ("DFSR=%x
",(*((volatile unsigned long *)(0xE000ED30))));
35   printf ("AFSR=%x
",(*((volatile unsigned long *)(0xE000ED3C))));
36   printf ("SCB_SHCSR=%x
", SCB->SHCSR);
37  
38   
39   while (1);
40 }

hard_fault_handler_c

1 void HardFault_Handler( void )
2 {
3 __ASM("TST LR, #4");
4 __ASM("ITE EQ");
5 __ASM("MRSEQ R0, MSP");
6 __ASM("MRSNE R0, PSP");
7 __ASM("B hard_fault_handler_c");
8 }

HardFault_Handler

这里的HardFault_Handler里是内联汇编

MDK不能使用内联汇编

1 __ASM void HardFault_Handler(void)
2 {
3       TST lr, #4     // Test for MSP or PSP
4       ITE EQ
5       MRSEQ r0, MSP
6       MRSNE r0, PSP
7       IMPORT HardFault_Handler_C
8       B HardFault_Handler_C
9 }

HardFault_Handler

 1 void HardFault_Handler_C (unsigned int * hardfault_args)
 2 {
 3   unsigned int stacked_r0;
 4   unsigned int stacked_r1;
 5   unsigned int stacked_r2;
 6   unsigned int stacked_r3;
 7   unsigned int stacked_r12;
 8   unsigned int stacked_lr;
 9   unsigned int stacked_pc;
10   unsigned int stacked_psr;
11  
12   stacked_r0 = ((unsigned long) hardfault_args[0]);
13   stacked_r1 = ((unsigned long) hardfault_args[1]);
14   stacked_r2 = ((unsigned long) hardfault_args[2]);
15   stacked_r3 = ((unsigned long) hardfault_args[3]);
16  
17   stacked_r12 = ((unsigned long) hardfault_args[4]);
18   stacked_lr = ((unsigned long) hardfault_args[5]);
19   stacked_pc = ((unsigned long) hardfault_args[6]);
20   stacked_psr = ((unsigned long) hardfault_args[7]);
21  
22   printf ("

[Hard fault handler - all numbers in hex]
");
23   printf ("R0 = %x
", stacked_r0);
24   printf ("R1 = %x
", stacked_r1);
25   printf ("R2 = %x
", stacked_r2);
26   printf ("R3 = %x
", stacked_r3);
27   printf ("R12 = %x
", stacked_r12);
28   printf ("LR [R14] = %x  subroutine call return address
", stacked_lr);
29   printf ("PC [R15] = %x  program counter
", stacked_pc);
30   printf ("PSR = %x
", stacked_psr);
31   printf ("BFAR = %x
", (*((volatile unsigned long *)(0xE000ED38))));
32   printf ("CFSR = %x
", (*((volatile unsigned long *)(0xE000ED28))));
33   printf ("HFSR = %x
", (*((volatile unsigned long *)(0xE000ED2C))));
34   printf ("DFSR = %x
", (*((volatile unsigned long *)(0xE000ED30))));
35   printf ("AFSR = %x
", (*((volatile unsigned long *)(0xE000ED3C))));
36   printf ("SCB_SHCSR = %x
", SCB->SHCSR);
37  
38   while (1);
39 }

HardFault_Handler_C

 1 [Hard fault handler - all numbers in hex]
 2 R0 = 11111000
 3 R1 = 8000378
 4 R2 = 8000379
 5 R3 = c0
 6 R12 = 400
 7 LR [R14] = 8001759  subroutine call return address
 8 PC [R15] = 8000340  program counter
 9 PSR = 1000000
10 BFAR = 11111111
11 CFSR = 8200
12 HFSR = 40000000
13 DFSR = 1
14 AFSR = 0
15 SCB_SHCSR = 0

对于调试很有帮助的，注意PC[R15]的数值是我们需要的