mcount.s

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    1 /*
    2  * Copyright (c) 2003 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 
   26 #define __NO_UNDERSCORES__
   27 #include <i386/asm.h>
   28 #include <assym.s>
   29 
   30 Entry(mcount)
   31         pushl   %ebp                    // setup mcount's frame
   32         movl    %esp,%ebp
   33         pushf                           // save interrupt state
   34         cli                             // disable interrupts
   35 
   36         //
   37         // Check that %gs, with segment pointing at the per-cpu data area,
   38         // has been set up. C routines (mp_desc_init() in particular) may
   39         // be called very early before this happens.
   40         //
   41         mov     %gs,%ax
   42         test    %ax,%ax
   43         jz      1f
   44 
   45         //
   46         // Check that this cpu is ready.
   47         // This delays the start of mcounting until a cpu is really prepared.
   48         //
   49         movl    %gs:CPD_CPU_STATUS,%eax
   50         testl   %eax,%eax
   51         jz      1f
   52 
   53         //
   54         // Test for recursion as indicated by a per-cpu flag.
   55         // Skip if nested, otherwise set the flag and call the C mount().
   56         //
   57         movl    %gs:CPD_MCOUNT_OFF,%eax
   58         testl   %eax,%eax               // test for recursion
   59         jnz     1f
   60         incl    %gs:CPD_MCOUNT_OFF      // set recursion flag
   61 
   62         movl    (%ebp),%eax             // frame pointer of mcount's caller
   63         movl    4(%eax),%eax            // mcount's caller's return address
   64         pushl   4(%ebp)                 // push selfpc parameter for mcount()
   65         pushl   %eax                    // push frompc parameter for mcount()
   66         call    _mcount                 // call the C mcount
   67         addl    $8,%esp                 // pop args
   68 
   69         decl    %gs:CPD_MCOUNT_OFF      // turn off recursion flag
   70 1:
   71         popf                            // restore interrupt state
   72         movl    %ebp,%esp               // tear down mcount's frame
   73         popl    %ebp
   74         ret

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FreeBSD/Linux Kernel Cross Reference sys/osfmk/i386/mcount.s

FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/mcount.s