dyld3/StartGlue.h

   1 /*
   2  * Copyright (c) 2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef __START_GLUE_H__
  25 #define __START_GLUE_H__
  26
  27 // Implemented in start_glue.s
  28 // Declare 'start' as a character, so that we can index into it.
  29 // Avoid arithmetic on function pointers.
  30 extern "C" char start;
  31
  32
  33 // <rdar://problem/12792039> need 'start' to be one atom, but entry is in interior
  34
  35 #if __x86_64__ || __i386__
  36         #define address_of_start (void*)((uintptr_t)&start + 1)
  37 #elif __arm64__
  38         #define address_of_start (void*)((uintptr_t)&start + 4)
  39 #elif __arm__
  40         #define address_of_start (void*)((uintptr_t)&start + 2)
  41 #endif
  42
  43
  44
  45 #endif // __START_GLUE_H__