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

   1 /*
   2  * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 2004 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /*
  27  * Interposing support.
  28  * When OBJC_ALLOW_INTERPOSING is set, calls to objc_msgSend_rtp
  29  * jump to the ordinary messenger via this stub. If objc_msgSend
  30  * itself is interposed, dyld will find and change this stub.
  31  * This stub must be compiled into a separate linker module.
  32  */
  33
  34         .data
  35         .align 4, 0x90
  36 L_get_pc_thunk.edx:
  37         movl    (%esp,1), %edx
  38         ret
  39
  40         .data
  41         .picsymbol_stub
  42 L_objc_msgSend$stub:
  43         .indirect_symbol _objc_msgSend
  44         call    L_get_pc_thunk.edx
  45 1:
  46         movl    L_objc_msgSend$lz-1b(%edx),%ecx
  47         jmp     %ecx
  48 L_objc_msgSend$stub_binder:
  49         lea     L_objc_msgSend$lz-1b(%edx),%eax
  50         pushl   %eax
  51         jmp     dyld_stub_binding_helper
  52         nop
  53
  54         .data
  55         .lazy_symbol_pointer
  56 L_objc_msgSend$lz:
  57         .indirect_symbol _objc_msgSend
  58         .long L_objc_msgSend$stub_binder
  59
  60         .text
  61         .align 4, 0x90
  62         .globl _objc_msgSend_stub
  63 _objc_msgSend_stub:
  64         jmp     L_objc_msgSend$stub