ports/sysdeps/mips/init-first.c

   1 /* Initialization code run first thing by the ELF startup code.  For mips/Unix.
   2    Copyright (C) 1996, 1997, 2010 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 extern void __libc_global_ctors (void);
  23
  24
  25 static void
  26 init (int *data)
  27 {
  28   int argc = *data;
  29   char **argv = (void *) (data + 1);
  30   char **envp = &argv[argc + 1];
  31
  32   __environ = envp;
  33   __libc_init (argc, argv, envp);
  34 }
  35
  36 #ifdef SHARED
  37 /* This function is called to initialize the shared C library.
  38    It is called just before the user _start code from mips/elf/start.S,
  39    with the stack set up as that code gets it.  */
  40
  41 /* NOTE!  The linker notices the magical name `_init' and sets the DT_INIT
  42    pointer in the dynamic section based solely on that.  It is convention
  43    for this function to be in the `.init' section, but the symbol name is
  44    the only thing that really matters!!  */
  45 /*void _init (int argc, ...) __attribute__ ((unused, section (".init")));*/
  46
  47 void
  48 _init (int argc, ...)
  49 {
  50   init (&argc);
  51
  52 #ifndef NO_CTORS_DTORS_SECTIONS
  53   __libc_global_ctors ();
  54 #endif
  55 }
  56 #endif
  57
  58
  59 void
  60 __libc_init_first (int argc __attribute__ ((unused)), ...)
  61 {
  62 #ifndef SHARED
  63   init (&argc);
  64 #endif
  65 }