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genode/repos/base/src/lib/startup/spec/arm/crt0.s

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Imported Genode release 11.11
2011-12-22 16:19:25 +01:00
/**
* \brief Startup code for Genode applications on ARM
* \author Norman Feske
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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* \author Martin Stein
Imported Genode release 11.11
2011-12-22 16:19:25 +01:00
* \date 2007-04-28
*/
/*
Update copyright headers to 2013
2013-01-10 21:44:47 +01:00
* Copyright (C) 2007-2013 Genode Labs GmbH
Imported Genode release 11.11
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*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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/**************************
** .text (program code) **
**************************/
Imported Genode release 11.11
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.section ".text.crt0"
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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/* program entry-point */
.global _start
_start:
ldso: Make truly self relocatable On Linux the linker can now be loaded at arbitrary addresses, this became necessary for newer kernel versions. The 'linux_arm' target is not supported. Issue #1728
2015-11-26 10:30:23 +01:00
.global _start_initial_stack
_start_initial_stack:
Imported Genode release 11.11
2011-12-22 16:19:25 +01:00
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
2014-01-28 14:30:36 +01:00
/* make initial value of some registers available to higher-level code */
ldr r4, =__initial_sp
base-linux: add ARM support This patch introduces a new platform 'linux_arm' for building and running Genode/Linux on an ARM device. Known limitations: - libc 'setjmp()'/'longjmp()' doesn't currently save/restore floating point registers Fixes #746.
2013-05-24 11:04:42 +02:00
str sp, [r4]
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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/*
* Install initial temporary environment that is replaced later by the
* environment that init_main_thread creates.
*/
ldr sp, =_stack_high
ldso: use generic CRT0 files Issue #1042
2014-02-05 15:15:39 +01:00
/* if this is the dynamic linker, init_rtld relocates the linker */
bl init_rtld
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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/* create proper environment for main thread */
bl init_main_thread
Imported Genode release 11.11
2011-12-22 16:19:25 +01:00
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
2014-01-28 14:30:36 +01:00
/* apply environment that was created by init_main_thread */
ldr sp, =init_main_thread_result
ldr sp, [sp]
Imported Genode release 11.11
2011-12-22 16:19:25 +01:00
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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/* jump into init C code instead of calling it as it should never return */
b _main
/*********************************
** .bss (non-initialized data) **
*********************************/
base-linux: add ARM support This patch introduces a new platform 'linux_arm' for building and running Genode/Linux on an ARM device. Known limitations: - libc 'setjmp()'/'longjmp()' doesn't currently save/restore floating point registers Fixes #746.
2013-05-24 11:04:42 +02:00
Imported Genode release 11.11
2011-12-22 16:19:25 +01:00
.section ".bss"
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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/* stack of the temporary initial environment */
ARM stack alignment Align the stack on a 16-byte boundary as on the x86_32 platform. Fixes #236.
2012-06-12 14:37:00 +02:00
.p2align 4
base: downsize initial main-thread stack As the initial main-thread stack is not used for the whole main-thread life anymore but only for the initialization of the Genode environment it can be downsized to 32Kb for all architectures. ref #989
2014-02-06 01:32:52 +01:00
.space 32 * 1024
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
2014-01-28 14:30:36 +01:00
_stack_high:
Imported Genode release 11.11
2011-12-22 16:19:25 +01:00
crt0 cleanup - use the generic 'crt0.s' for Linux - move the read-only '__dso_handle' definition into the '.text' section - move the '__initial_sp' definition into the '.bss' section - remove the '_main_utcb' definition Part of #766.
2013-06-06 17:43:13 +02:00
/* initial value of the SP register */
base: setup thread object for main thread in CRT0 For a main thread a thread object is created by the CRT0 before _main gets called so that _main can already run in a generic environment that, e.g., catches stack overflows as a page-fault instead of corrupting the BSS. Additionally dynamic programs have only one CRT0 - the one of the LDSO - which does the initialization for both LDSO and program. ref #989
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.global __initial_sp
__initial_sp:
.space 4