samd10-uart-bootloader/startup_samd10.c at master · EmbeddedEnterprises/samd10-uart-bootloader · GitHub

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//-----------------------------------------------------------------------------
void irq_handler_reset(void);

extern int main(void);

extern void _stack_top(void);
extern unsigned int _etext;
extern unsigned int _data;
extern unsigned int _edata;
extern unsigned int _bss;
extern unsigned int _ebss;

//-----------------------------------------------------------------------------
__attribute__ ((used, section(".vectors")))
void (* const vectors[])(void) =
{
  &_stack_top,                   // 0 - Initial Stack Pointer Value
  irq_handler_reset,             // 1 - Reset
};

//-----------------------------------------------------------------------------
__attribute__ ((noinline, section(".romfunc")))
void irq_handler_reset(void)
{
  unsigned int *src, *dst;

  src = &_etext;
  dst = &_data;
  while (dst < &_edata)
    *dst++ = *src++;

  dst = &_bss;
  while (dst < &_ebss)
    *dst++ = 0;

  main();
}