crt0.cpp

///////////////////////////////////////////////////////////////////////////////
//  Copyright Christopher Kormanyos 2007 - 2023.
//  Copyright Amine Chalandi 2023.
//  Distributed under the Boost Software License,
//  Version 1.0. (See accompanying file LICENSE_1_0.txt
//  or copy at http://www.boost.org/LICENSE_1_0.txt)
//

// Generic Cortex-M startup code.

#include <mcal_cpu.h>

namespace crt
{
  void init_ram();
  void init_ctors();
}

extern "C" void __my_startup() __attribute__((used, noinline));

void __my_startup()
{
  // Load the stack pointer.
  // The stack pointer is automatically loaded from
  // the base position of the interrupt vector table.
  // So we do nothing here.

  // Oscillator initialization.
  mcal::cpu::init();

  // Initialize statics from ROM to RAM.
  // Zero-clear default-initialized static RAM.
  crt::init_ram();
  //mcal::wdg::secure::trigger();

  // Call all ctor initializations.
  crt::init_ctors();
  //mcal::wdg::secure::trigger();

  // Jump to main (and never return).
  asm volatile("ldr r3, =main");
  asm volatile("blx r3");

  // Catch an unexpected return from main.
  for(;;)
  {
    // Replace with a loud error if desired.
    ;
  }
}