main.c

// Copyright (c) 2022 Cesanta Software Limited
// All rights reserved

int main(void) {
  return 0;
}

// Startup code
__attribute__((naked, noreturn)) void _reset(void) {
  // memset .bss to zero, and copy .data section to RAM region
  extern long _sbss, _ebss, _sdata, _edata, _sidata;
  for (long *src = &_sbss; src < &_ebss; src++) *src = 0;
  for (long *src = &_sdata, *dst = &_sidata; src < &_edata;) *src++ = *dst++;

  main();             // Call main()
  for (;;) (void) 0;  // Infinite loop in the case if main() returns
}

extern void _estack(void);  // Defined in link.ld

// 16 standard and 91 STM32-specific handlers
__attribute__((section(".vectors"))) void (*tab[16 + 91])(void) = {_estack,
                                                                   _reset};