uclibc-ng/libc/sysdeps/linux/i386/crt0.c

/*
 * uClibc/sysdeps/linux/i386/crt0.S
 * Pull stuff off the stack and get uClibc moving.
 *
 * Copyright (C) 2001 by Lineo, inc.  
 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
 * who is very pleased he managed to do this entirely in C code.
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

extern void __uClibc_main(int argc,void *argv,void *envp);

/* a little bit of stuff to support C++ */
__asm__(".section .ctors,\"aw\"\n.align 4\n.global __CTOR_LIST__\n"
	"__CTOR_LIST__:\n.long -1\n");

__asm__(".section .dtors,\"aw\"\n.align 4\n.global __DTOR_LIST__\n"
	"__DTOR_LIST__:\n.long -1\n");

void _start(unsigned int first_arg)
{
	unsigned int argc;
	char **argv, **envp;
	unsigned long *stack;

	stack = (unsigned long*) &first_arg;
	argc = *(stack - 1);
	argv = (char **) stack;
	envp = (char **)stack + argc + 1;

	__uClibc_main(argc, argv, envp);
}