begin.c revision 20c4a3a8eee5ca8c87ae377732f541baffce1fda
11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 220c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin * Copyright (C) 2012 The Android Open Source Project 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions of source code must retain the above copyright 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions in binary form must reproduce the above copyright 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * the documentation and/or other materials provided with the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2920c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupinextern unsigned __linker_init(unsigned int *elfdata); 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 3120c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin__attribute__((visibility("hidden"))) 3220c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupinvoid _start() { 3320c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin void *elfdata; 3420c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin void (*start)(void); 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 3620c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin elfdata = __builtin_frame_address(0) + sizeof(void *); 3720c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin start = (void(*)(void))__linker_init(elfdata); 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 3920c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin /* linker init returns (%eax) the _entry address in the main image */ 4020c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin /* entry point expects sp to point to elfdata */ 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4220c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin __asm__ ( 4320c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin "mov %0, %%esp\n\t" 4420c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin "jmp *%1\n\t" 4520c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin : : "r"(elfdata), "r"(start) : 4620c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin ); 4720c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin 4820c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin /* Unreachable */ 4920c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin} 5020c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin 5120c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin/* Since linker has its own version of crtbegin (this file) it should have */ 5220c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin/* own version of __stack_chk_fail_local for the case when it's built with */ 5320c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin/* stack protector feature */ 5420c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin 5520c4a3a8eee5ca8c87ae377732f541baffce1fdaPavel Chupin#include "arch-x86/bionic/__stack_chk_fail_local.h" 56