i386/gen/mcount.s

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 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 #import <architecture/i386/asm_help.h>
  26
  27 .text
  28         .globl mcount
  29 mcount:
  30         pushl   %ebp            // setup mcount's frame
  31         movl    %esp,%ebp
  32
  33         movl    (%ebp),%eax     // load the frame pointer of mcount's caller
  34         movl    4(%eax),%eax    // load mcount's caller's return address
  35         pushl   4(%ebp)         // push the selfpc parameter for moncount()
  36         pushl   %eax            // push the frompc parameter for moncount()
  37         CALL_EXTERN(_moncount)  // call moncount()
  38
  39         movl    %ebp,%esp       // tear down mcount's frame
  40         popl    %ebp
  41         ret