Catching hard faults

[johankraft]

I'm trying to test some fault exceptions on STM32F4 but with moderate success.

I manage to generate a UsageFault (ended up in UsageFault_Handler_C) when doing this:
void (*bad_fun_ptr_usagefault)(int) = &"THIS IS NOT CODE, CRASH GOD DAMN IT!";
bad_fun_ptr_usagefault(3);

I also managed to crash it by overwriting the return address from a function, but no exception handler was called.

More subtle errors are ignored. It just keeps running despite doing things like unaligned memory accesses and division by zero.

I have added the following to enable the fault exceptions. This runs in the end of _initialize_hardware.

SCB->CCR |= SCB_CCR_DIV_0_TRP_Msk
| SCB_CCR_UNALIGN_TRP_Msk;

SCB->SHCSR |= SCB_SHCSR_USGFAULTENA_Msk
| SCB_SHCSR_BUSFAULTENA_Msk
| SCB_SHCSR_MEMFAULTENA_Msk;

Does anyone have any idea what is missing?

[ilg-ul]

The implementation of hard faults in the deprecated qemu-system-gnuarmeclipse was not complete.

I suggest you use the new qemu-system-arm.