/* * Copyright (C) 2008 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ .text .align 4 .type _start,#function .globl _start # this is the small startup code that is first run when # any executable that is statically-linked with Bionic # runs. # # it's purpose is to call __libc_init with appropriate # arguments, which are: # # - the address of the raw data block setup by the Linux # kernel ELF loader # # - address of an "onexit" function, not used on any # platform supported by Bionic # # - address of the "main" function of the program. We # can't hard-code it in the adr pseudo instruction # so we use a tiny trampoline that will get relocated # by the dynamic linker before this code runs # # - address of the constructor list # _start: mov r0, sp mov r1, #0 adr r2, 0f adr r3, 1f b __libc_init 0: b main 1: .long __PREINIT_ARRAY__ .long __INIT_ARRAY__ .long __FINI_ARRAY__ .long __CTOR_LIST__ # the .ctors section contains a list of pointers to "constructor" # functions that need to be called in order during C library initialization, # just before the program is being run. This is a C++ requirement # # the last entry shall be 0, and is defined in crtend.S # .section .preinit_array, "aw" .globl __PREINIT_ARRAY__ __PREINIT_ARRAY__: .long -1 .section .init_array, "aw" .globl __INIT_ARRAY__ __INIT_ARRAY__: .long -1 .section .fini_array, "aw" .globl __FINI_ARRAY__ __FINI_ARRAY__: .long -1 .section .ctors, "aw" .globl __CTOR_LIST__ __CTOR_LIST__: .long -1