1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28/*
29 * libc_init_static.c
30 *
31 * The program startup function __libc_init() defined here is
32 * used for static executables only (i.e. those that don't depend
33 * on shared libraries). It is called from arch-$ARCH/bionic/crtbegin_static.S
34 * which is directly invoked by the kernel when the program is launched.
35 *
36 * The 'structors' parameter contains pointers to various initializer
37 * arrays that must be run before the program's 'main' routine is launched.
38 */
39
40#include <stddef.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <stdint.h>
44#include <elf.h>
45#include "pthread_internal.h"
46#include "atexit.h"
47#include "libc_init_common.h"
48
49#include <bionic_tls.h>
50#include <errno.h>
51
52static void call_array(void(**list)())
53{
54    // First element is -1, list is null-terminated
55    while (*++list) {
56        (*list)();
57    }
58}
59
60__noreturn void __libc_init(uintptr_t *elfdata,
61                       void (*onexit)(void),
62                       int (*slingshot)(int, char**, char**),
63                       structors_array_t const * const structors)
64{
65    int  argc;
66    char **argv, **envp;
67
68    /* Initialize the C runtime environment */
69    __libc_init_common(elfdata);
70
71    /* Several Linux ABIs don't pass the onexit pointer, and the ones that
72     * do never use it.  Therefore, we ignore it.
73     */
74
75    /* pre-init array. */
76    call_array(structors->preinit_array);
77
78    /* .ctors section initializers, for non-arm-eabi ABIs */
79    call_array(structors->ctors_array);
80
81    // call static constructors
82    call_array(structors->init_array);
83
84    argc = (int) *elfdata;
85    argv = (char**)(elfdata + 1);
86    envp = argv + argc + 1;
87
88    /* The executable may have its own destructors listed in its .fini_array
89     * so we need to ensure that these are called when the program exits
90     * normally.
91     */
92    if (structors->fini_array)
93        __cxa_atexit(__libc_fini,structors->fini_array,NULL);
94
95    exit(slingshot(argc, argv, envp));
96}
97