sortix-mirror/libc/x86/crt1.s

/*******************************************************************************

	Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.

	This file is part of the Sortix C Library.

	The Sortix C Library is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	The Sortix 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 Lesser General Public
	License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.

	crt1.s
	Implement the _start symbol at which execution begins which performs the
	task of initializing the standard library and executing the main function.

*******************************************************************************/

/* NOTE: This is almost identical to what is in start.s. crt1.s is used when
         compiling with the real cross compiler, while start.s is used when
         using the older hacky way of building Sortix. Please try to keep these
         files alike by doing changes both places until we only build Sortix
         with real cross compilers. */

.section .text

.global _start
.type _start, @function
_start:
	movl %ecx, environ # envp

	# Arguments for main
	push %ebx # argv
	push %eax # argc

	# Prepare signals, memory allocation, stdio and such.
	call initialize_standard_library

	# Run the global constructors.
	call _init

	# Run main
	call main

	# Terminate the process with main's exit code.
	push %eax
	call exit
.size _start, .-_start