70 lines
1.5 KiB
ArmAsm
70 lines
1.5 KiB
ArmAsm
/**
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* \brief Startup code for Genode applications on ARM
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* \author Norman Feske
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* \author Martin Stein
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* \date 2007-04-28
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*/
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/*
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* Copyright (C) 2007-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/**************************
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** .text (program code) **
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**************************/
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.section ".text.crt0"
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/* program entry-point */
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.global _start
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_start:
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/* make initial value of some registers available to higher-level code */
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ldr r4, =__initial_sp
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str sp, [r4]
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/*
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* Install initial temporary environment that is replaced later by the
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* environment that init_main_thread creates.
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*/
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ldr sp, =_stack_high
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/* create proper environment for main thread */
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bl init_main_thread
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/* apply environment that was created by init_main_thread */
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ldr sp, =init_main_thread_result
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ldr sp, [sp]
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/* jump into init C code instead of calling it as it should never return */
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b _main
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/*********************************
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** .bss (non-initialized data) **
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*********************************/
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.section ".bss"
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/* stack of the temporary initial environment */
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.p2align 4
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.global _stack_low
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_stack_low:
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.space 128 * 1024
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.global _stack_high
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_stack_high:
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/* initial value of the SP register */
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.global __initial_sp
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__initial_sp:
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.space 4
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/* return value of init_main_thread */
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.global init_main_thread_result
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init_main_thread_result:
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.space 4
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