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/* Initialization code run first thing by the ELF startup code. Linux version.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <unistd.h>
#include <sysdep.h>
#include "fpu_control.h"
/* This code is mostly the same for all machines. This version works at
least for i386 and m68k, and probably any CISCy machine with a normal
stack arrangement. */
extern void __libc_init (int, char **, char **);
extern void __libc_global_ctors (void);
static void
init (int *data)
{
int argc = *data;
char **argv = (void *) (data + 1);
char **envp = &argv[argc + 1];
#ifdef __i386__
/* Make sure we are not using the iBSC2 personality. The `personality'
syscall takes one argument; zero means the Linux personality. The
argument arrives in %ebx; we have to save and restore %ebx by hand
here, because GCC (as of 2.7.0) cannot handle saving and restoring it
for us when it is the dedicated GOT register for PIC. */
asm ("pushl %%ebx\n"
"xorl %%ebx, %%ebx\n"
"int $0x80 # syscall no %0\n"
"popl %%ebx"
: : "a" (SYS_ify (personality)));
#endif
/* Set the FPU control word to the proper default value. */
__setfpucw (__fpu_control);
__environ = envp;
__libc_init (argc, argv, envp);
}
#ifdef PIC
/* This function is called to initialize the shared C library.
It is called just before the user _start code from i386/elf/start.S,
with the stack set up as that code gets it. */
/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT
pointer in the dynamic section based solely on that. It is convention
for this function to be in the `.init' section, but the symbol name is
the only thing that really matters!! */
/*void _init (int argc, ...) __attribute__ ((unused, section (".init")));*/
void
_init (int argc, ...)
{
init (&argc);
__libc_global_ctors ();
}
#endif
void
__libc_init_first (int argc __attribute__ ((unused)), ...)
{
#ifndef PIC
init (&argc);
#endif
}
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