sysdeps/sh/init-first.c

   1 /* Initialization code run first thing by the ELF startup code.  For SH.
   2    Copyright (C) 1995-1998, 2000, 2001, 2002 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 <unistd.h>
  20
  21 extern void __libc_init (int, char **, char **);
  22 #ifdef USE_NONOPTION_FLAGS
  23 extern void __getopt_clean_environment (char **);
  24 #endif
  25 extern void __libc_global_ctors (void);
  26
  27 int __libc_multiple_libcs attribute_hidden = 1;
  28
  29 static void
  30 init (int *data)
  31 {
  32   int argc = *data;
  33   char **argv = (void *) (data + 1);
  34   char **envp = &argv[argc + 1];
  35
  36   __environ = envp;
  37   __libc_init (argc, argv, envp);
  38
  39 #ifdef USE_NONOPTION_FLAGS
  40   /* This is a hack to make the special getopt in GNU libc working.  */
  41   __getopt_clean_environment (envp);
  42 #endif
  43 }
  44
  45 #ifdef SHARED
  46 /* This function is called to initialize the shared C library.
  47    It is called just before the user _start code from sh/sh[34]/elf/start.S,
  48    with the stack set up as that code gets it.  */
  49
  50 /* NOTE!  The linker notices the magical name `_init' and sets the DT_INIT
  51    pointer in the dynamic section based solely on that.  It is convention
  52    for this function to be in the `.init' section, but the symbol name is
  53    the only thing that really matters!!  */
  54 /*void _init (int argc, ...) __attribute__ ((unused, section (".init")));*/
  55
  56 void
  57 _init (int argc, ...)
  58 {
  59   init (&argc);
  60
  61 #ifndef NO_CTORS_DTORS_SECTIONS
  62   __libc_global_ctors ();
  63 #endif
  64 }
  65 #endif
  66
  67
  68 void
  69 __libc_init_first (int argc __attribute__ ((unused)), ...)
  70 {
  71 #ifndef SHARED
  72   init (&argc);
  73 #endif
  74 }