crtbegin_static.S revision 5e30a6ae149e670c03ee614acd3fc9f1fb23ef45 
1# bionic/arch-x86/bionic/crtbegin_static.S
2#
3# Copyright 2006, The Android Open Source Project
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions are met:
7#     * Redistributions of source code must retain the above copyright
8#       notice, this list of conditions and the following disclaimer.
9#     * Redistributions in binary form must reproduce the above copyright
10#       notice, this list of conditions and the following disclaimer in the
11#       documentation and/or other materials provided with the distribution.
12#     * Neither the name of Google Inc. nor the names of its contributors may
13#       be used to endorse or promote products derived from this software
14#       without specific prior written permission.
15#
16# THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR
17# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19# EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27	.text
28	.align 4
29	.type _start, @function
30	.globl _start
31
32# this is the small startup code that is first run when
33# any executable that is statically-linked with Bionic
34# runs.
35#
36# it's purpose is to call __libc_init with appropriate
37# arguments, which are:
38#
39#    - the address of the raw data block setup by the Linux
40#      kernel ELF loader
41#
42#    - address of an "onexit" function, not used on any
43#      platform supported by Bionic
44#
45#    - address of the "main" function of the program. We
46#      can't hard-code it in the adr pseudo instruction
47#      so we use a tiny trampoline that will get relocated
48#      by the dynamic linker before this code runs
49#
50#    - address of the constructor list
51#
52_start:
53        mov     %esp, %eax
54        # before push arguments, align the stack to a 16 byte boundary
55        andl    $~15, %esp
56        mov     $1f, %edx
57        pushl   %edx
58        mov     $0f, %edx
59        pushl   %edx
60        mov     $0, %edx
61        pushl   %edx
62        pushl   %eax
63        call    __libc_init
64
650:  jmp   main
66
671:  .long   __PREINIT_ARRAY__
68    .long   __INIT_ARRAY__
69    .long   __FINI_ARRAY__
70
71	.section .preinit_array, "aw"
72	.globl __PREINIT_ARRAY__
73__PREINIT_ARRAY__:
74	.long -1
75
76	.section .init_array, "aw"
77	.globl __INIT_ARRAY__
78__INIT_ARRAY__:
79	.long -1
80	.long	frame_dummy
81
82	.section .fini_array, "aw"
83	.globl __FINI_ARRAY__
84__FINI_ARRAY__:
85	.long -1
86	.long	__do_global_dtors_aux
87
88	.section	.eh_frame,"a",@progbits
89	.align 4
90	.type	__EH_FRAME_BEGIN__, @object
91__EH_FRAME_BEGIN__:
92	.text
93	.p2align 4,,15
94	.type	__do_global_dtors_aux, @function
95__do_global_dtors_aux:
96	pushl	%ebp
97	movl	%esp, %ebp
98	subl	$24, %esp
99	cmpb	$0, completed.4454
100	jne	.L4
101	movl	$__deregister_frame_info_bases, %eax
102	testl	%eax, %eax
103	je	.L3
104	movl	$__EH_FRAME_BEGIN__, (%esp)
105	call	__deregister_frame_info_bases
106.L3:
107	movb	$1, completed.4454
108.L4:
109	leave
110	ret
111	.text
112	.p2align 4,,15
113	.type	frame_dummy, @function
114frame_dummy:
115	pushl	%ebp
116	movl	$__register_frame_info_bases, %eax
117	movl	%esp, %ebp
118	subl	$24, %esp
119	testl	%eax, %eax
120	je	.L7
121	movl	%ebx, 12(%esp)
122	movl	$0, 8(%esp)
123	movl	$object.4466, 4(%esp)
124	movl	$__EH_FRAME_BEGIN__, (%esp)
125	call	__register_frame_info_bases
126.L7:
127	leave
128	ret
129	.local	completed.4454
130	.comm	completed.4454,1,1
131	.local	object.4466
132	.comm	object.4466,24,4
133	.weak	__register_frame_info_bases
134	.weak	__deregister_frame_info_bases
135
136#include "__dso_handle.S"
137#include "atexit.S"
138#include "__stack_chk_fail_local.S"
139