src/start_glue.s

   1 /*
   2  * Copyright (c) 2011 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
  25
  26 #ifdef __i386__
  27
  28     .align 2
  29     .globl _start
  30     .private_extern _start
  31 _start:
  32         nop             # <rdar://problem/10753356> backtraces of LC_MAIN binaries don't end in "start"
  33 Lstart:
  34         movl    %eax,(%esp)         # pass result from main() to exit()
  35         call    _exit
  36         hlt
  37
  38 #endif /* __i386__ */
  39
  40
  41 #if __x86_64__
  42
  43     .align 2
  44     .globl _start
  45     .private_extern _start
  46 _start:
  47         nop             # <rdar://problem/10753356> backtraces of LC_MAIN binaries don't end in "start"
  48 Lstart:
  49         movl    %eax,%edi           # pass result from main() to exit()
  50         call    _exit
  51         hlt
  52
  53 #endif
  54
  55
  56 #if __arm__
  57
  58     .align 2
  59         .code   16
  60     .globl _start
  61     .private_extern _start
  62         .thumb_func     _start
  63 _start:
  64         nop                                     // <rdar://problem/10753356> backtraces of LC_MAIN binaries don't end in "start"
  65 Lstart:
  66         bl      _exit                   // result in r0 already in param reg r0
  67         trap
  68
  69 #endif /* __arm__ */
  70
  71
  72 #if __arm64__
  73
  74     .align 2
  75     .globl _start
  76     .private_extern _start
  77 _start:
  78         nop
  79 Lstart:
  80         bl      _exit                   // result in x0 already in param reg x0
  81         brk     #3
  82
  83 #endif /* __arm64__ */
  84
  85         .subsections_via_symbols
  86