x86_64/gen/mcount.s

   1 /*
   2  * Copyright (c) 1999-2006 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         pushq   %rbp             // setup mcount's frame
  29         movq    %rsp,    %rbp
  30         subq    $64,     %rsp    // allocate space for storage and alignment
  31         movq    %rax,  0(%rsp)
  32         movq    %rdi,  8(%rsp)
  33         movq    %rsi, 16(%rsp)
  34         movq    %rdx, 24(%rsp)
  35         movq    %rcx, 32(%rsp)
  36         movq    %r8,  40(%rsp)
  37         movq    %r9,  48(%rsp)
  38         movq    (%rbp),  %rsi    // load the frame pointer of mcount's caller
  39         movq    8(%rsi), %rsi    // load mcount's caller's return address
  40         movq    8(%rbp), %rdi    // set up the selfpc parameter for moncount()
  41         CALL_EXTERN(_moncount)   // call moncount()
  42         movq    48(%rsp), %r9
  43         movq    40(%rsp), %r8
  44         movq    32(%rsp), %rcx
  45         movq    24(%rsp), %rdx
  46         movq    16(%rsp), %rsi
  47         movq     8(%rsp), %rdi
  48         movq     0(%rsp), %rax
  49
  50         movq    %rbp, %rsp
  51         popq    %rbp             // tear down frame
  52         ret