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      1 /*
      2  * Copyright (C) 2013 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 "../../bionic/libc_init_common.h"
     30 #include <stddef.h>
     31 #include <stdint.h>
     32 
     33 __attribute__ ((section (".preinit_array")))
     34 void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
     35 
     36 __attribute__ ((section (".init_array")))
     37 void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
     38 
     39 __attribute__ ((section (".fini_array")))
     40 void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
     41 
     42 
     43 __LIBC_HIDDEN__ void do_arm64_start(void* raw_args) {
     44   structors_array_t array;
     45   array.preinit_array = &__PREINIT_ARRAY__;
     46   array.init_array = &__INIT_ARRAY__;
     47   array.fini_array = &__FINI_ARRAY__;
     48   __libc_init(raw_args, NULL, &main, &array);
     49 }
     50 
     51 /*
     52  * Put the value of sp in x0 and call do_arm64_init(). The latter will then
     53  * then be able to access the stack as prepared by the kernel's execve system
     54  * call (via the first argument).
     55  */
     56 __asm__ (
     57 "        .text                      \n"
     58 "        .align  2                  \n"
     59 "        .global _start             \n"
     60 "        .hidden _start             \n"
     61 "        .type   _start, %function  \n"
     62 "_start:                            \n"
     63 "        add     x0, sp, xzr        \n"
     64 "        b       do_arm64_start   \n"
     65 "        .size   _start, .-_start   \n"
     66 );
     67 
     68 #include "../../arch-common/bionic/__dso_handle.h"
     69 #include "../../arch-common/bionic/atexit.h"
     70