Cortex-M3 在C中上报入栈的寄存器和各fault状态寄存器

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

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 ;
}