sysdeps/generic/machine-gmon.h

   1 /* Machine-dependent definitions for profiling support.  Generic GCC 2 version.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 /* GCC version 2 gives us a perfect magical function to get
  21    just the information we need:
  22      void *__builtin_return_address (unsigned int N)
  23    returns the return address of the frame N frames up.  */
  24
  25 /* Be warned that GCC cannot usefully compile __builtin_return_address(N)
  26    for N != 0 on all machines.  In this case, you may have to write
  27    your own version of _mcount().  */
  28
  29 #if __GNUC__ < 2
  30  #error "This file uses __builtin_return_address, a GCC 2 extension."
  31 #endif
  32
  33 #include <sysdep.h>
  34 #ifndef NO_UNDERSCORES
  35 /* The asm symbols for C functions are `_function'.
  36    The canonical name for the counter function is `mcount', no _.  */
  37 void _mcount (void) asm ("mcount");
  38 #else
  39 /* The canonical name for the function is `_mcount' in both C and asm,
  40    but some old asm code might assume it's `mcount'.  */
  41 void _mcount (void);
  42 weak_alias (_mcount, mcount)
  43 #endif
  44
  45 static void mcount_internal (u_long frompc, u_long selfpc);
  46
  47 #define _MCOUNT_DECL(frompc, selfpc) \
  48 static inline void mcount_internal (u_long frompc, u_long selfpc)
  49
  50 #define MCOUNT \
  51 void _mcount (void)                                                           \
  52 {                                                                             \
  53   mcount_internal ((u_long) __builtin_return_address (1),                     \
  54                    (u_long) __builtin_return_address (0));                    \
  55 }