sortix-mirror/libc/x86/crt0.S

63 lines
1.8 KiB
ArmAsm

/*
* Copyright (c) 2011, 2012, 2014 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* x86/crt0.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
.global __start
.type _start, @function
.type __start, @function
_start:
__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
subl $12, %esp
push %ecx # envp (to main)
push %ebx # argv (to main)
push %eax # argc (to main)
subl $4, %esp
push %ecx # envp (to initialize_standard_library)
push %ebx # argv (to initialize_standard_library)
push %eax # argc (to initialize_standard_library)
# Initialize the standard library.
call initialize_standard_library
addl $16, %esp
# Run the global constructors.
call _init
# Run main
call main
# Terminate the process with main's exit code.
subl $12, %esp
push %eax
call exit
.size _start, .-_start
.size __start, .-__start