i386/gen/mcount.s

   1 /*
   2  * Copyright (c) 1999 Apple Computer, 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 #import <architecture/i386/asm_help.h>
  24
  25 .text
  26         .globl mcount
  27 mcount:
  28         pushl   %ebp            // setup mcount's frame
  29         movl    %esp,%ebp
  30
  31         movl    (%ebp),%eax     // load the frame pointer of mcount's caller
  32         movl    4(%eax),%eax    // load mcount's caller's return address
  33         pushl   4(%ebp)         // push the selfpc parameter for moncount()
  34         pushl   %eax            // push the frompc parameter for moncount()
  35         CALL_EXTERN(_moncount)  // call moncount()
  36
  37         movl    %ebp,%esp       // tear down mcount's frame
  38         popl    %ebp
  39         ret