runtime/Messengers.subproj/objc-msg-stub-ppc.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         .picsymbol_stub
  36 L_objc_msgSend$stub:
  37         .indirect_symbol _objc_msgSend
  38         mflr    r0
  39         bcl     20,31,1f
  40 1:
  41         mflr    r11
  42         addis   r11,r11,ha16(L_objc_msgSend$lazy_ptr-1b)
  43         mtlr    r0
  44         lwz     r12,lo16(L_objc_msgSend$lazy_ptr-1b)(r11)
  45         mtctr   r12
  46         addi    r11,r11,lo16(L_objc_msgSend$lazy_ptr-1b)
  47         bctr
  48
  49         .data
  50         .lazy_symbol_pointer
  51 L_objc_msgSend$lazy_ptr:
  52         .indirect_symbol _objc_msgSend
  53         .long dyld_stub_binding_helper
  54
  55         .text
  56         .align 4
  57         .globl _objc_msgSend_stub
  58
  59 _objc_msgSend_stub:
  60         b       L_objc_msgSend$stub