exception-handlers.h File Reference

#include <stdint.h>

Go to the source code of this file.

Classes
struct	exception_stack_frame_s

Typedefs
typedef struct exception_stack_frame_s	exception_stack_frame_t

Functions
void	HardFault_Handler (void)
void	HardFault_Handler_C (exception_stack_frame_t *frame, uint32_t lr)
void	NMI_Handler (void)
void	PendSV_Handler (void)
void	Reset_Handler (void)
void	SVC_Handler (void)
void	SysTick_Handler (void)

Typedef Documentation

exception_stack_frame_t

typedef struct exception_stack_frame_s exception_stack_frame_t

Function Documentation

HardFault_Handler()

void HardFault_Handler

(

void

)

HardFault_Handler_C()

void HardFault_Handler_C	(	exception_stack_frame_t *	frame,
		uint32_t	lr
	)

NMI_Handler()

void NMI_Handler

(

void

)

Definition at line 117 of file exception-handlers.c.

{
#if defined(DEBUG)
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
  if ((CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) != 0)
    {
      __BKPT (0);
    }
#else
  __BKPT (0);
#endif /* defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) */
#endif /* defined(DEBUG) */
 
  while (true)
    {
      __NOP ();
    }
}

PendSV_Handler()

void PendSV_Handler

(

void

)

Definition at line 725 of file exception-handlers.c.

{
#if defined(DEBUG)
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
  if ((CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) != 0)
    {
      __BKPT (0);
    }
#else
  __BKPT (0);
#endif /* defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) */
#endif /* defined(DEBUG) */
 
  while (true)
    {
      __NOP ();
    }
}

Reset_Handler()

void Reset_Handler

(

void

)

Definition at line 81 of file exception-handlers.c.

{
  // For just in case, when started via QEMU.
  __asm__ (" MSR msp, %0 " : : "r"(&__stack) :);
 
  // SCB
  // https://developer.arm.com/documentation/dui0552/a/cortex-m3-peripherals/system-control-block
 
  // SCB->VTOR
  // https://developer.arm.com/documentation/dui0552/a/cortex-m3-peripherals/system-control-block/vector-table-offset-register
  // Mandatory when running from RAM. Not available on Cortex-M0.
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
  *((uint32_t*)0xE000ED08)
      = ((uint32_t)_interrupt_vectors & (uint32_t)(~0x3F));
#endif
 
#if defined(__ARM_FP)
  // Enable CP10 and CP11 coprocessor.
  // SCB->CPACR |= (0xF << 20);
  *((uint32_t*)0xE000ED88) |= (uint32_t)(0xF << 20);
 
  // Lazy save.
  // FPU->FPCCR |= FPU_FPCCR_ASPEN_Msk | FPU_FPCCR_LSPEN_Msk;
  *((uint32_t*)0xE000EF34) |= (uint32_t)(0x3 << 29);
#endif // defined(__ARM_FP)
 
  // Fill the main stack with a pattern, to detect usage and underflow.
  for (unsigned int* p = &_Heap_Limit; p < &__stack;)
    {
      *p++ = OS_INTEGER_RTOS_STACK_FILL_MAGIC; // DEADBEEF
    }
 
  _start ();
}

References __stack, _Heap_Limit, _interrupt_vectors, and _start().

SVC_Handler()

void SVC_Handler

(

void

)

Definition at line 685 of file exception-handlers.c.

{
#if defined(DEBUG)
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
  if ((CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) != 0)
    {
      __BKPT (0);
    }
#else
  __BKPT (0);
#endif /* defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) */
#endif /* defined(DEBUG) */
 
  while (true)
    {
      __NOP ();
    }
}

SysTick_Handler()

void SysTick_Handler

(

void

)

Definition at line 745 of file exception-handlers.c.

{
  // DO NOT loop, just return.
  // Useful in case someone (like STM HAL) always enables SysTick.
}