Cortex-M3 在C中上报入栈的寄存器和各fault状态寄存器

因为在标准C语音中是不能获取SP指针的。因而，如果想通过C代码来获取入栈的寄存器值，需要配合一小段汇编代码来获取当前的SP值，然后再把这个SP值以参数形式传送给C代码，最后以指针的形式把栈中的各寄存器值输出，同时也可以输出一些想要的各种状态寄存器值。如下：

Keil环境汇编封皮：

 HardFault_Handler\

                 PROC

                 EXPORT  HardFault_Handler         [WEAK]

                 IMPORT    hard_fault_handler_c

                 TST     LR, #

                 ITE     EQ

                 MRSEQ    R0, MSP

                 MRSNE    R0, PSP

                 B        hard_fault_handler_c

                 ENDP

C服务程序，输入为SP的值：

 void hard_fault_handler_c( unsigned int *reg )

 {

     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 int)reg[];

     stacked_r1 = (unsigned int)reg[];

     stacked_r2 = (unsigned int)reg[];

     stacked_r3 = (unsigned int)reg[];

     stacked_r12 = (unsigned int)reg[];

     stacked_lr = (unsigned int)reg[];

     stacked_pc = (unsigned int)reg[];

     stacked_psr = (unsigned int)reg[];

     while(  )

     {

         printf("--> %s\r\n", __FUNCTION__);

         //printf("EXC_RETURN: %08X\r\n", r1);

         printf("R0: %08X\r\n", stacked_r0);

         printf("R1: %08X\r\n", stacked_r1);

         printf("R2: %08X\r\n", stacked_r2);

         printf("R3: %08X\r\n", stacked_r3);

         printf("R12: %08X\r\n", stacked_r12);

         printf("LR: %08X\r\n", stacked_lr);

         printf("PC: %08X\r\n", stacked_pc);

         printf("PSR: %08X\r\n", stacked_psr);

         // 系统handler控制及状态寄存器

         printf("SHCSR: %08X\r\n", (*(volatile unsigned int *)(0xE000ED24)));

         //printf("MFSR: %02X\r\n", (*(volatile unsigned char *)(0xE000ED28)));

         //printf("BFSR: %02X\r\n", (*(volatile unsigned char *)(0xE000ED29)));

         //printf("UFSR: %04X\r\n", (*(volatile unsigned short *)(0xE000ED2A)));

         // 存储器管理fault、总线fault、用法fault状态寄存器

         printf("CFSR: %08X\r\n", (*(volatile unsigned int *)(0xE000ED28)));

         // 硬fault状态寄存器

         printf("HFSR: %08X\r\n", (*(volatile unsigned int *)(0xE000ED2C)));

         // 调试fault状态寄存器

         printf("DFSR: %08X\r\n", (*(volatile unsigned int *)(0xE000ED30)));

         // 存储器管理fault地址寄存器

         printf("MMAR: %08X\r\n", (*(volatile unsigned int *)(0xE000ED34)));

         // 总线fault地址寄存器

         printf("BFAR: %08X\r\n", (*(volatile unsigned int *)(0xE000ED38)));

         // 辅助fault地址寄存器

         printf("AFAR: %08X\r\n", (*(volatile unsigned int *)(0xE000ED3C)));

     }

     return ;

 }

参考摘录：

《ARM Cortex-M3权威指南.pdf》

巴特西

Cortex-M3 在C中上报入栈的寄存器和各fault状态寄存器

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