libc
/* $Id$ */
/* Copyright (c) 2006-2018 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System libc */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
_start:
/* reset the stack */
xor %ebp, %ebp
/* setup the environment */
pop %eax /* argc */
mov %esp, %ebx /* argv */
push %eax
mov %eax, %ecx /* envp */
inc %ecx
shl $2, %ecx
add %ebx, %ecx
mov %ecx, environ /* environ */
#if defined(__ELF__)
mov %ecx, %edx /* auxv */
auxv:
cmpl $0x0, (%edx)
jz auxv_done
add $0x4, %edx
jmp auxv
auxv_done:
add $0x4, %edx
push %edx
#endif
push %ecx
push %ebx
push %eax
#if defined(__ELF__)
push %edx
#endif
#if defined(__SSP__)
/* initialize SSP */
call __stack_chk_setup
#endif
#if defined(__ELF__)
/* initialize dlfcn */
call __start_dlfcn
add $0x4, %esp
#endif
/* initialize stdio */
call __start_stdio
/* call the global constructors */
call _init
/* run the program */
call main
#if defined(__ELF__)
add $0x10, %esp
#else
add $0xc, %esp
#endif
push %eax
/* call the global destructors */
call _fini
/* exit the program */
call exit
add $0x4, %esp
hlt