aux-mcount.c

gcc-2.95.3 Linux下最常用的C编译器

/* Profiling support code for A/UX 
   Copyright (C) 1996 Free Software Foundation, Inc.

This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file with other programs, and to distribute
those programs without any restriction coming from the use of this
file.  (The General Public License restrictions do apply in other
respects; for example, they cover modification of the file, and
distribution when not linked into another program.)

This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* As a special exception, if you link this library with files
   compiled with GCC to produce an executable, this does not cause
   the resulting executable to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

/* This routine is called at the beginning of functions compiled with -p
   or -pg.  The A/UX libraries call mcount%, but gas cannot generate 
   symbols with embedded percent signs.  Previous ports of GCC to A/UX 
   have done things like (1) assemble a stub routine with the native
   assembler, or (2) assemble a stub routine with gas and edit the object
   file.  This solution has the advantage that it can interoperate with
   the A/UX version and can be used in an eventual port of glibc to A/UX.  */

#ifndef __GNUC__
#error This file uses GNU C extensions
#endif

#include <mon.h>

#ifdef IN_GCC
#include "tm.h"
#endif

struct cnt *_countbase;

#ifdef FUNCTION_PROFILER_SYMBOL
void __mcount() __asm__(FUNCTION_PROFILER_SYMBOL);
#endif

void __mcount()
{
  register long **pfncnt __asm__("%a0");
  register long *fncnt = *pfncnt;

  if (!fncnt)
    {
      struct cnt *newcnt = _countbase++;
      newcnt->fnpc = (char *)__builtin_return_address(0);
      *pfncnt = fncnt = &newcnt->mcnt;
    }
  *fncnt += 1;
}