runtime/Messengers.subproj/objc-msg-stub-i386.s

   1 /*
   2  * Copyright (c) 2004, 2006 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  * Interposing support.
  26  * When OBJC_ALLOW_INTERPOSING is set, calls to objc_msgSend_rtp
  27  * jump to the ordinary messenger via this stub. If objc_msgSend
  28  * itself is interposed, dyld will find and change this stub.
  29  * This stub must be compiled into a separate linker module.
  30  */
  31
  32         .data
  33         .align 4, 0x90
  34 L_get_pc_thunk.edx:
  35         movl    (%esp,1), %edx
  36         ret
  37
  38         .data
  39         .picsymbol_stub
  40 L_objc_msgSend$stub:
  41         .indirect_symbol _objc_msgSend
  42         call    L_get_pc_thunk.edx
  43 1:
  44         movl    L_objc_msgSend$lz-1b(%edx),%ecx
  45         jmp     *%ecx
  46 L_objc_msgSend$stub_binder:
  47         lea     L_objc_msgSend$lz-1b(%edx),%eax
  48         pushl   %eax
  49         jmp     dyld_stub_binding_helper
  50         nop
  51
  52         .data
  53         .lazy_symbol_pointer
  54 L_objc_msgSend$lz:
  55         .indirect_symbol _objc_msgSend
  56         .long L_objc_msgSend$stub_binder
  57
  58         .text
  59         .align 4, 0x90
  60         .private_extern _objc_msgSend_stub
  61 _objc_msgSend_stub:
  62         jmp     L_objc_msgSend$stub