1  /* Initialization code run first thing by the ELF startup code.  Common version
       2     Copyright (C) 1995-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stdio.h>
      20  #include <stdlib.h>
      21  #include <fcntl.h>
      22  #include <unistd.h>
      23  #include <sysdep.h>
      24  #include <fpu_control.h>
      25  #include <sys/param.h>
      26  #include <sys/types.h>
      27  #include <libc-internal.h>
      28  
      29  #include <ldsodefs.h>
      30  
      31  /* Remember the command line argument and environment contents for
      32     later calls of initializers for dynamic libraries.  */
      33  int __libc_argc attribute_hidden;
      34  char **__libc_argv attribute_hidden;
      35  
      36  
      37  void
      38  __libc_init_first (int argc, char **argv, char **envp)
      39  {
      40  #ifdef SHARED
      41    /* For DSOs we do not need __libc_init_first but an ELF constructor.  */
      42  }
      43  
      44  static void __attribute__ ((constructor))
      45  _init_first (int argc, char **argv, char **envp)
      46  {
      47  #endif
      48  
      49    /* Make sure we don't initialize twice.  */
      50  #ifdef SHARED
      51    if (__libc_initial)
      52      {
      53        /* Set the FPU control word to the proper default value if the
      54  	 kernel would use a different value.  */
      55        if (__fpu_control != GLRO(dl_fpu_control))
      56  	__setfpucw (__fpu_control);
      57      }
      58  #endif
      59  
      60    /* Save the command-line arguments.  */
      61    __libc_argc = argc;
      62    __libc_argv = argv;
      63    __environ = envp;
      64  
      65  #ifndef SHARED
      66    /* First the initialization which normally would be done by the
      67       dynamic linker.  */
      68    _dl_non_dynamic_init ();
      69  #endif
      70  
      71    __init_misc (argc, argv, envp);
      72  }
      73  
      74  /* This function is defined here so that if this file ever gets into
      75     ld.so we will get a link error.  Having this file silently included
      76     in ld.so causes disaster, because the _init_first definition above
      77     will cause ld.so to gain an ELF constructor, which is not a cool
      78     thing. */
      79  
      80  extern void _dl_start (void) __attribute__ ((noreturn));
      81  
      82  void
      83  _dl_start (void)
      84  {
      85    abort ();
      86  }