gcc/config/m68k/aux-mcount.c

   1 /* Profiling support code for A/UX
   2    Copyright (C) 1996 Free Software Foundation, Inc.
   3
   4 This file is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 2, or (at your option) any
   7 later version.
   8
   9 In addition to the permissions in the GNU General Public License, the
  10 Free Software Foundation gives you unlimited permission to link the
  11 compiled version of this file with other programs, and to distribute
  12 those programs without any restriction coming from the use of this
  13 file.  (The General Public License restrictions do apply in other
  14 respects; for example, they cover modification of the file, and
  15 distribution when not linked into another program.)
  16
  17 This file is distributed in the hope that it will be useful, but
  18 WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with this program; see the file COPYING.  If not, write to
  24 the Free Software Foundation, 59 Temple Place - Suite 330,
  25 Boston, MA 02111-1307, USA.  */
  26
  27 /* As a special exception, if you link this library with files
  28    compiled with GCC to produce an executable, this does not cause
  29    the resulting executable to be covered by the GNU General Public License.
  30    This exception does not however invalidate any other reasons why
  31    the executable file might be covered by the GNU General Public License.  */
  32
  33 /* This routine is called at the beginning of functions compiled with -p
  34    or -pg.  The A/UX libraries call mcount%, but gas cannot generate
  35    symbols with embedded percent signs.  Previous ports of GCC to A/UX
  36    have done things like (1) assemble a stub routine with the native
  37    assembler, or (2) assemble a stub routine with gas and edit the object
  38    file.  This solution has the advantage that it can interoperate with
  39    the A/UX version and can be used in an eventual port of glibc to A/UX.  */
  40
  41 #ifndef __GNUC__
  42 #error This file uses GNU C extensions
  43 #endif
  44
  45 #include <mon.h>
  46
  47 #ifdef IN_GCC
  48 #include "tm.h"
  49 #endif
  50
  51 struct cnt *_countbase;
  52
  53 #ifdef FUNCTION_PROFILER_SYMBOL
  54 void __mcount() __asm__(FUNCTION_PROFILER_SYMBOL);
  55 #endif
  56
  57 void __mcount()
  58 {
  59   register long **pfncnt __asm__("%a0");
  60   register long *fncnt = *pfncnt;
  61
  62   if (!fncnt)
  63     {
  64       struct cnt *newcnt = _countbase++;
  65       newcnt->fnpc = (char *)__builtin_return_address(0);
  66       *pfncnt = fncnt = &newcnt->mcnt;
  67     }
  68   *fncnt += 1;
  69 }