6b4dbe0358
This prepares for an incompatible compiler toolchain change scheduled for Sortix 0.10 development where crt0.o is used instead of crt1.o.
58 lines
1.7 KiB
ArmAsm
58 lines
1.7 KiB
ArmAsm
/*******************************************************************************
|
|
|
|
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/>.
|
|
|
|
x64/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
|
|
.type _start, @function
|
|
_start:
|
|
# Set up end of the stack frame linked list.
|
|
xorl %ebp, %ebp
|
|
pushq %rbp # rip=0
|
|
pushq %rbp # rbp=0
|
|
movq %rsp, %rbp
|
|
|
|
movq %rcx, environ # envp
|
|
|
|
# Prepare signals, memory allocation, stdio and such.
|
|
pushq %rsi
|
|
pushq %rdi
|
|
pushq %rcx
|
|
call initialize_standard_library
|
|
|
|
# Run the global constructors.
|
|
call _init
|
|
|
|
# Run main
|
|
popq %rdx # Note! envp is now %rdx (previously %rcx)
|
|
popq %rdi
|
|
popq %rsi
|
|
call main
|
|
|
|
# Terminate the process with main's exit code.
|
|
movl %eax, %edi
|
|
call exit
|
|
.size _start, .-_start
|