sysdeps/generic/machine-gmon.h

   1 /* Machine-dependent definitions for profiling support.  Generic GCC 2 version.
   2 Copyright (C) 1996 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
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, 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 #if __GNUC__ < 2
  26  #error "This file uses __builtin_return_address, a GCC 2 extension."
  27 #endif
  28
  29 #include <sysdep.h>
  30 #ifndef NO_UNDERSCORES
  31 /* The asm symbols for C functions are `_function'.
  32    The canonical name for the counter function is `mcount', no _.  */
  33 void _mcount (void) asm ("mcount");
  34 #else
  35 /* The canonical name for the function is `_mcount' in both C and asm,
  36    but some old asm code might assume it's `mcount'.  */
  37 void _mcount (void);
  38 weak_alias (_mcount, mcount)
  39 #endif
  40
  41 static void mcount_internal (u_long frompc, u_long selfpc);
  42
  43 #define _MCOUNT_DECL(frompc, selfpc) \
  44 static inline void mcount_internal (frompc, selfpc)
  45
  46 #define MCOUNT \
  47 void _mcount (void)                                                           \
  48 {                                                                             \
  49   mcount_internal ((u_long) __builtin_return_address (0),                     \
  50                    (u_long) __builtin_return_address (1));                    \
  51 }