104 lines
3 KiB
C
104 lines
3 KiB
C
/* Initialization code run first thing by the ELF startup code. Linux version.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <unistd.h>
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#include <sysdep.h>
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#include <fpu_control.h>
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#include <linux/personality.h>
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#include "init-first.h"
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extern void __libc_init (int, char **, char **);
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extern void __libc_global_ctors (void);
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/* The function is called from assembly stubs the compiler can't see. */
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static void init (void *) __attribute__ ((unused));
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extern int _dl_starting_up;
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weak_extern (_dl_starting_up)
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/* Set nonzero if we have to be prepared for more then one libc being
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used in the process. Safe assumption if initializer never runs. */
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int __libc_multiple_libcs = 1;
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/* Remember the command line argument and enviroment contents for
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later calls of initializers for dynamic libraries. */
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int __libc_argc;
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char **__libc_argv;
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char **__libc_envp;
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static void
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init (void *data)
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{
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extern int __personality (int);
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__libc_multiple_libcs = &_dl_starting_up && ! _dl_starting_up;
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/* We must not call `personality' twice. */
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if (!__libc_multiple_libcs)
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{
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/* The argument we got points to the values describing the
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command line argument etc. */
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__libc_argc = *(int *)data;
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__libc_argv = (char **)data + 1;
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__libc_envp = &__libc_argv[__libc_argc + 1];
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/* The `personality' system call takes one argument that chooses
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the "personality", i.e. the set of system calls and such. We
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must make this call first thing to disable emulation of some
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other system that might have been enabled by default based on
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the executable format. */
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__personality (PER_LINUX);
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/* Set the FPU control word to the proper default value. */
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__setfpucw (__fpu_control);
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}
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else
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{
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/* The argument we got points to the values describing the
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command line argument etc. */
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__libc_argc = *((int *)data)++;
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__libc_argv = *((char ***)data)++;
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__libc_envp = *(char ***)data;
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}
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__environ = __libc_envp;
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__libc_init (__libc_argc, __libc_argv, __libc_envp);
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#ifdef PIC
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__libc_global_ctors ();
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#endif
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}
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#ifdef PIC
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SYSDEP_CALL_INIT(_init, init);
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void
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__libc_init_first (void)
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{
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}
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#else
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SYSDEP_CALL_INIT(__libc_init_first, init);
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#endif
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