runtime/Messengers.subproj/objc-msg-stub-ppc64.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         .section __TEXT, __picsymbol_stub, symbol_stubs, pure_instructions, 32
  34 L_objc_msgSend$stub:
  35         .indirect_symbol _objc_msgSend
  36         mflr    r0
  37         bcl     20,31,1f
  38 1:
  39         mflr    r11
  40         addis   r11,r11,ha16(L_objc_msgSend$lazy_ptr-1b)
  41         mtlr    r0
  42         ldu     r12,lo16(L_objc_msgSend$lazy_ptr-1b)(r11)
  43         mtctr   r12
  44         bctr
  45
  46         .data
  47         .lazy_symbol_pointer
  48 L_objc_msgSend$lazy_ptr:
  49         .indirect_symbol _objc_msgSend
  50         .quad dyld_stub_binding_helper
  51
  52         .text
  53         .align 4
  54         .private_extern _objc_msgSend_stub
  55
  56 _objc_msgSend_stub:
  57         b       L_objc_msgSend$stub