зеркало из https://github.com/mozilla/gecko-dev.git
71 строка
2.5 KiB
C
71 строка
2.5 KiB
C
|
/* ***** BEGIN LICENSE BLOCK *****
|
||
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
||
|
|
*
|
||
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
||
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
||
|
|
* the License. You may obtain a copy of the License at
|
||
|
|
* http://www.mozilla.org/MPL/
|
||
|
|
*
|
||
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
||
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
||
|
|
* for the specific language governing rights and limitations under the
|
||
|
|
* License.
|
||
|
|
*
|
||
|
|
* The Original Code is ``mcount''
|
||
|
|
*
|
||
|
|
* The Initial Developer of the Original Code is Netscape
|
||
|
|
* Communications Corp. Portions created by the Initial Developer are
|
||
|
|
* Copyright (C) 2001 the Initial Developer. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Contributor(s):
|
||
|
|
* Chris Waterson <waterson@netscape.com>
|
||
|
|
*
|
||
|
|
* Alternatively, the contents of this file may be used under the terms of
|
||
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
||
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
||
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
||
|
|
* of those above. If you wish to allow use of your version of this file only
|
||
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
||
|
|
* use your version of this file under the terms of the MPL, indicate your
|
||
|
|
* decision by deleting the provisions above and replace them with the notice
|
||
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
||
|
|
* the provisions above, a recipient may use your version of this file under
|
||
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
||
|
|
*
|
||
|
|
* ***** END LICENSE BLOCK ***** */
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
A library that can be LD_PRELOAD-ed to dump a function's address on
|
||
|
|
function entry.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* When compiled with `-pg' (or even just `-p'), gcc inserts a call to
|
||
|
|
* |mcount| in each function prologue. This implementation of |mcount|
|
||
|
|
* will grab the return address from the stack, and write it to stdout
|
||
|
|
* as a binary stream, creating a gross execution trace the
|
||
|
|
* instrumented program.
|
||
|
|
*
|
||
|
|
* For more info on gcc inline assembly, see:
|
||
|
|
*
|
||
|
|
* <http://www.ibm.com/developerworks/linux/library/l-ia.html?dwzone=linux>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
mcount()
|
||
|
|
{
|
||
|
|
register unsigned int caller;
|
||
|
|
unsigned int buf[1];
|
||
|
|
|
||
|
|
// Grab the return address.
|
||
|
|
asm("movl 4(%%esp),%0"
|
||
|
|
: "=r"(caller));
|
||
|
|
|
||
|
|
buf[0] = caller;
|
||
|
|
write(STDOUT_FILENO, buf, sizeof buf[0]);
|
||
|
|
}
|