| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 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 | .text |
| 29 | .align 4 |
| 30 | .type _start,#function |
| 31 | .globl _start |
| 32 | |
| 33 | # this is the small startup code that is first run when |
| 34 | # any executable that is statically-linked with Bionic |
| 35 | # runs. |
| 36 | # |
| 37 | # it's purpose is to call __libc_init with appropriate |
| 38 | # arguments, which are: |
| 39 | # |
| 40 | # - the address of the raw data block setup by the Linux |
| 41 | # kernel ELF loader |
| 42 | # |
| 43 | # - address of an "onexit" function, not used on any |
| 44 | # platform supported by Bionic |
| 45 | # |
| 46 | # - address of the "main" function of the program. We |
| 47 | # can't hard-code it in the adr pseudo instruction |
| 48 | # so we use a tiny trampoline that will get relocated |
| 49 | # by the dynamic linker before this code runs |
| 50 | # |
| 51 | # - address of the constructor list |
| 52 | # |
| 53 | _start: |
| 54 | mov r0, sp |
| 55 | mov r1, #0 |
| 56 | adr r2, 0f |
| 57 | adr r3, 1f |
| 58 | b __libc_init |
| 59 | |
| 60 | 0: b main |
| 61 | |
| 62 | 1: .long __PREINIT_ARRAY__ |
| 63 | .long __INIT_ARRAY__ |
| 64 | .long __FINI_ARRAY__ |
| 65 | .long __CTOR_LIST__ |
| 66 | |
| 67 | # the .ctors section contains a list of pointers to "constructor" |
| 68 | # functions that need to be called in order during C library initialization, |
| 69 | # just before the program is being run. This is a C++ requirement |
| 70 | # |
| 71 | # the last entry shall be 0, and is defined in crtend.S |
| 72 | # |
| 73 | .section .preinit_array, "aw" |
| 74 | .globl __PREINIT_ARRAY__ |
| 75 | __PREINIT_ARRAY__: |
| 76 | .long -1 |
| 77 | |
| 78 | .section .init_array, "aw" |
| 79 | .globl __INIT_ARRAY__ |
| 80 | __INIT_ARRAY__: |
| 81 | .long -1 |
| 82 | |
| 83 | .section .fini_array, "aw" |
| 84 | .globl __FINI_ARRAY__ |
| 85 | __FINI_ARRAY__: |
| 86 | .long -1 |
| 87 | |
| 88 | .section .ctors, "aw" |
| 89 | .globl __CTOR_LIST__ |
| 90 | __CTOR_LIST__: |
| 91 | .long -1 |
| 92 | |