77 lines
1.6 KiB
ArmAsm
77 lines
1.6 KiB
ArmAsm
/**
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* \brief Startup code for Genode applications on ARM 64-bit
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* \author Stefan Kalkowski
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* \date 2019-03-26
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*/
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/*
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* Copyright (C) 2019 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 Affero General Public License version 3.
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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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.global _start_initial_stack
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_start_initial_stack:
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/* make initial value of some registers available to higher-level code */
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ldr x4, =__initial_sp
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mov x5, sp
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str x5, [x4]
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ldr x4, =__initial_x0
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str x0, [x4]
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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 x4, =_stack_high
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mov sp, x4
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/* if this is the dynamic linker, init_rtld relocates the linker */
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bl init_rtld
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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 x4, =init_main_thread_result
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ldr x4, [x4]
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mov sp, x4
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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 8
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.global __initial_stack_base
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__initial_stack_base:
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.space 12*1024
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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 8
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/* initial value of the X0 register */
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.global __initial_x0
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__initial_x0:
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.space 8
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