libc/startup/baremetal/init.cpp

   1 //===-- Implementation file of __libc_init_array --------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/macros/config.h"
  10 #include <stddef.h>
  11 #include <stdint.h>
  12
  13 namespace LIBC_NAMESPACE_DECL {
  14
  15 extern "C" {
  16 extern uintptr_t __preinit_array_start[];
  17 extern uintptr_t __preinit_array_end[];
  18 extern uintptr_t __init_array_start[];
  19 extern uintptr_t __init_array_end[];
  20 }
  21
  22 using InitCallback = void(void);
  23
  24 extern "C" void __libc_init_array(void) {
  25   size_t preinit_array_size = __preinit_array_end - __preinit_array_start;
  26   for (size_t i = 0; i < preinit_array_size; ++i)
  27     reinterpret_cast<InitCallback *>(__preinit_array_start[i])();
  28   size_t init_array_size = __init_array_end - __init_array_start;
  29   for (size_t i = 0; i < init_array_size; ++i)
  30     reinterpret_cast<InitCallback *>(__init_array_start[i])();
  31 }
  32
  33 } // namespace LIBC_NAMESPACE_DECL