libc
/* $Id$ */
/* Copyright (c) 2009-2017 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 %rbp, %rbp /* stack */
mov %rdi, %rsp
/* setup the environment */
mov (%rsp), %rdi /* argc */
mov %rsp, %rsi /* argv */
add $0x8, %rsi
mov %rdi, %rdx /* envp */
shl $3, %rdx
add %rsi, %rdx
add $0x8, %rdx
#ifdef __PIC__ /* environ */
mov environ@GOTPCREL(%rip), %rcx
mov %rdx, (%rcx)
#else
mov %rdx, environ
#endif
push %rdi
push %rsi
push %rdx
#ifdef __ELF__
mov %rdx, %rcx /* auxv */
auxv:
cmpq $0x0, (%rcx)
jz auxv_done
add $0x8, %rcx
jmp auxv
auxv_done:
add $0x8, %rcx
push %rcx
#endif
#if defined(__SSP__)
/* initialize SSP */
# ifdef __PIC__
call __stack_chk_setup@PLT
# else
call __stack_chk_setup
# endif
#endif
#ifdef __ELF__
/* initialize dlfcn */
pop %rdi
# ifdef __PIC__
call __start_dlfcn@PLT
# else
call __start_dlfcn
# endif
#endif
/* initialize stdio */
# ifdef __PIC__
call __start_stdio@PLT
# else
call __start_stdio
# endif
/* run the program */
pop %rdx
pop %rsi
pop %rdi
#ifdef __PIC__
call main@PLT
#else
call main
#endif
/* exit the program */
mov %rax, %rdi
#ifdef __PIC__
call exit@PLT
#else
call exit
#endif
hlt