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