1
0
Fork 0
mirror of https://gitlab.com/sortix/sortix.git synced 2023-02-13 20:55:38 -05:00
sortix--sortix/libmaxsi/x64/crt1.s

55 lines
1.7 KiB
ArmAsm
Raw Normal View History

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of LibMaxsi.
LibMaxsi 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.
LibMaxsi 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 LibMaxsi. 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:
movq %rcx, environ # envp
# Prepare signals, memory allocation, stdio and such.
pushq %rsi
pushq %rdi
call initialize_standard_library
# Run the global constructors.
call _init
# Run main
popq %rdi
popq %rsi
call main
# Terminate the process with main's exit code.
movl %eax, %edi
call exit