arm hardfault handler

출처 : https://stackoverflow.com/questions/21293580/atmel-studio-dummy-handler

인터럽트 소스 얻어오는 방법

uint32_t phantomISR = 9999;

void Dummy_Handler(void)
{
    while(1) {
        phantomISR = __get_IPSR();
    }
}

ISR_NUMBER
This is the number of the current exception:
0 = Thread mode
1 = Reserved
2 = NMI
3 = Hard fault
4 = Memory management fault
5 = Bus fault
6 = Usage fault
7-10 = Reserved
11 = SVCall
12 = Reserved for Debug
13 = Reserved
14 = PendSV
15 = SysTick
16 = IRQ0
45 = IRQ29

SVC handler - gcc inline assembly

__attribute__((naked)) void SVC_Handler(void) {
    __asm__ __volatile__ (
    "   tst     lr, #0x4            \n\t"
    "   ite     eq                  \n\t"
    "   mrseq   r0, msp             \n\t"
    "   mrsne   r0, psp             \n\t"
    "   b   SVC_Handler_C           \n\t");
}

__attribute__((naked)) void SVC_Handler(void) {
    register unsigned int *svc_args __asm__("r0");

    __asm__ __volatile__ (
        "tst     lr, #0x4
         ite     eq
         mrseq   %0, msp
         mrsne   %0, psp" : "=r"(svc_args));

    return SVC_Handler_C(svc_args);
}

출처 : https://blog.frankvh.com/2011/12/07/cortex-m3-m4-hard-fault-handler/

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// From Joseph Yiu, minor edits by FVH // hard fault handler in C, // with stack frame location as input parameter // called from HardFault_Handler in file xxx.s 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); }