libc_init_common.c revision 3a654b1e04d4275ae315cfe1b196998acf10052c 
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#include <stddef.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <stdint.h>
33#include <elf.h>
34#include <asm/page.h>
35#include "pthread_internal.h"
36#include "atexit.h"
37#include "libc_init_common.h"
38
39#include <bionic_tls.h>
40#include <errno.h>
41
42extern void _init(void);
43extern void _fini(void);
44
45static void call_array(void(**list)())
46{
47    // First element is -1, list is null-terminated
48    while (*++list) {
49        (*list)();
50    }
51}
52
53static void __bionic_do_global_dtors(structors_array_t const * const p)
54{
55    call_array(p->fini_array);
56    //_fini();
57}
58
59extern unsigned __get_sp(void);
60extern pid_t    gettid(void);
61
62char*  __progname;
63char **environ;
64
65/* from asm/page.h */
66unsigned int __page_size = PAGE_SIZE;
67unsigned int __page_shift = PAGE_SHIFT;
68
69
70int __system_properties_init(void);
71
72void __libc_init_common(uintptr_t *elfdata,
73                       void (*onexit)(void),
74                       int (*slingshot)(int, char**, char**),
75                       structors_array_t const * const structors,
76                       void (*pre_ctor_hook)())
77{
78    pthread_internal_t thread;
79    pthread_attr_t thread_attr;
80    void *tls_area[BIONIC_TLS_SLOTS];
81    int argc;
82    char **argv, **envp, **envend;
83    struct auxentry *auxentry;
84    unsigned int page_size = 0, page_shift = 0;
85
86    /* The main thread's stack has empirically shown to be 84k */
87    unsigned stacktop = (__get_sp() & ~(PAGE_SIZE - 1)) + PAGE_SIZE;
88    unsigned stacksize = 128 * 1024; //84 * 1024;
89    unsigned stackbottom = stacktop - stacksize;
90
91    pthread_attr_init(&thread_attr);
92    pthread_attr_setstack(&thread_attr, (void*)stackbottom, stacksize);
93    _init_thread(&thread, gettid(), &thread_attr, (void*)stackbottom);
94    __init_tls(tls_area, &thread);
95
96    argc = (int) *elfdata++;
97    argv = (char**) elfdata;
98    envp = argv+(argc+1);
99    environ = envp;
100
101    __progname = argv[0] ? argv[0] : "<unknown>";
102
103    errno = 0;
104
105    __system_properties_init();
106
107    if (pre_ctor_hook) pre_ctor_hook();
108
109    // XXX: we should execute the .fini_array upon exit
110
111    // pre-init array.
112    // XXX: I'm not sure what's the different with the init array.
113    call_array(structors->preinit_array);
114
115    // for compatibility with non-eabi binary, call the .ctors section
116    call_array(structors->ctors_array);
117
118    // call static constructors
119    call_array(structors->init_array);
120
121    exit(slingshot(argc, argv, envp));
122}
123