1 /* 2 * Copyright (C) 2012 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 typedef struct 30 { 31 void (**preinit_array)(void); 32 void (**init_array)(void); 33 void (**fini_array)(void); 34 void (**ctor_list)(void); 35 } structors_array_t; 36 37 extern int main(int argc, char **argv, char **env); 38 39 extern void __libc_init( 40 unsigned int *elfdata, 41 void (*onexit)(void), 42 int (*slingshot)(int, char**, char**), 43 structors_array_t const * const structors 44 ); 45 46 __attribute__ ((section (".preinit_array"))) 47 void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1; 48 49 __attribute__ ((section (".init_array"))) 50 void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1; 51 52 __attribute__ ((section (".fini_array"))) 53 void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1; 54 55 __attribute__ ((section (".ctors"))) 56 void (*__CTOR_LIST__)(void) = (void (*)(void)) -1; 57 58 /* this is the small startup code that is first run when 59 any executable that is dynamically-linked with Bionic 60 runs. 61 62 it's purpose is to call __libc_init with appropriate 63 arguments, which are: 64 65 - the address of the raw data block setup by the Linux 66 kernel ELF loader 67 68 - address of an "onexit" function, not used on any 69 platform supported by Bionic 70 71 - address of the "main" function of the program. 72 73 - address of the constructor list 74 */ 75 76 __attribute__((visibility("hidden"))) 77 void _start() { 78 structors_array_t array; 79 void *elfdata; 80 81 array.preinit_array = &__PREINIT_ARRAY__; 82 array.init_array = &__INIT_ARRAY__; 83 array.fini_array = &__FINI_ARRAY__; 84 array.ctor_list = &__CTOR_LIST__; 85 86 elfdata = __builtin_frame_address(0) + sizeof(void *); 87 __libc_init(elfdata, (void *) 0, &main, &array); 88 } 89 90 #include "__dso_handle.h" 91 #include "atexit.h" 92
