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sortix--sortix/libc/x86/crt1.s

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/*******************************************************************************
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/>.
x86/crt1.s
Implement the _start symbol at which execution begins which performs the
task of initializing the standard library and executing the main function.
*******************************************************************************/
.section .text
.global _start
.type _start, @function
_start:
# Set up end of the stack frame linked list.
xorl %ebp, %ebp
pushl %ebp # rip=0
pushl %ebp # rbp=0
movl %esp, %ebp
movl %ecx, environ # envp
# Arguments for main
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push %ecx # envp
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
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.size _start, .-_start