75 lines
1.4 KiB
ArmAsm
75 lines
1.4 KiB
ArmAsm
/*
|
|
* \brief Startup code for Genode applications
|
|
* \author Christian Helmuth
|
|
* \date 2006-07-06
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
/*--- .text (program code) -------------------------*/
|
|
.text
|
|
|
|
.globl _start
|
|
_start:
|
|
|
|
movq __initial_sp@GOTPCREL(%rip), %rax
|
|
movq %rsp, (%rax)
|
|
/*
|
|
* environ = &argv[argc + 1]
|
|
* in Genode argc is always 1
|
|
*/
|
|
popq %rax /* argc */
|
|
popq %rax /* argv[0] */
|
|
popq %rax /* NULL */
|
|
movq lx_environ@GOTPCREL(%rip), %rax
|
|
movq %rsp, (%rax)
|
|
|
|
/* XXX Switch to our own stack. */
|
|
leaq _stack_high@GOTPCREL(%rip), %rax
|
|
movq (%rax), %rsp
|
|
|
|
/* Clear the base pointer so that stack backtraces will work. */
|
|
xorq %rbp,%rbp
|
|
|
|
/* Jump into init C code */
|
|
callq _main
|
|
|
|
/* We should never get here since _main does not return */
|
|
1: int $3
|
|
jmp 2f
|
|
.ascii "_main() returned."
|
|
2: jmp 1b
|
|
|
|
|
|
/*--------------------------------------------------*/
|
|
.data
|
|
.p2align 8
|
|
.globl __dso_handle
|
|
__dso_handle:
|
|
.quad 0
|
|
|
|
.globl __initial_sp
|
|
__initial_sp:
|
|
.quad 0
|
|
|
|
/*--- .eh_frame (exception frames) -----------------*/
|
|
/*
|
|
.section .eh_frame,"aw"
|
|
.globl __EH_FRAME_BEGIN__
|
|
__EH_FRAME_BEGIN__:
|
|
*/
|
|
|
|
/*--- .bss (non-initialized data) ------------------*/
|
|
.bss
|
|
.p2align 8
|
|
.globl _stack_low
|
|
_stack_low:
|
|
.space 64*1024
|
|
.globl _stack_high
|
|
_stack_high:
|