sysdeps/sh/init-first.c

   1 /* Initialization code run first thing by the ELF startup code.  For SH.
   2    Copyright (C) 1995-2012 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <ctype.h>
  20 #include <unistd.h>
  21
  22 extern void __libc_init (int, char **, char **);
  23 #ifdef USE_NONOPTION_FLAGS
  24 extern void __getopt_clean_environment (char **);
  25 #endif
  26 extern void __libc_global_ctors (void);
  27
  28 int __libc_multiple_libcs attribute_hidden = 1;
  29
  30 static void
  31 init (int *data)
  32 {
  33   int argc = *data;
  34   char **argv = (void *) (data + 1);
  35   char **envp = &argv[argc + 1];
  36
  37   __environ = envp;
  38   __libc_init (argc, argv, envp);
  39
  40 #ifdef USE_NONOPTION_FLAGS
  41   /* This is a hack to make the special getopt in GNU libc working.  */
  42   __getopt_clean_environment (envp);
  43 #endif
  44
  45   /* Initialize ctype data.  */
  46   __ctype_init ();
  47 }
  48
  49 #ifdef SHARED
  50 /* This function is called to initialize the shared C library.
  51    It is called just before the user _start code from sh/sh[34]/elf/start.S,
  52    with the stack set up as that code gets it.  */
  53
  54 /* NOTE!  The linker notices the magical name `_init' and sets the DT_INIT
  55    pointer in the dynamic section based solely on that.  It is convention
  56    for this function to be in the `.init' section, but the symbol name is
  57    the only thing that really matters!!  */
  58 /*void _init (int argc, ...) __attribute__ ((unused, section (".init")));*/
  59
  60 void
  61 _init (int argc, ...)
  62 {
  63   init (&argc);
  64
  65 #ifndef NO_CTORS_DTORS_SECTIONS
  66   __libc_global_ctors ();
  67 #endif
  68 }
  69 #endif
  70
  71
  72 void
  73 __libc_init_first (int argc __attribute__ ((unused)), ...)
  74 {
  75 #ifndef SHARED
  76   init (&argc);
  77 #endif
  78 }