sysdeps/i386/machine-gmon.h

   1 /* i386-specific implementation of profiling support.
   2    Copyright (C) 1997-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdep.h>
  21
  22 /* We need a special version of the `mcount' function since for ix86 it
  23    must not clobber any register.  This has several reasons:
  24      - there is a bug in gcc as of version 2.7.2.2 which prohibits the
  25        use of profiling together with nested functions
  26      - the ELF `fixup' function uses GCC's regparm feature
  27      - some (future) systems might want to pass parameters in registers.  */
  28
  29 /* We must not pollute the global namespace.  */
  30 #define mcount_internal __mcount_internal
  31
  32 extern void mcount_internal (u_long frompc, u_long selfpc)
  33   __attribute__ ((regparm (2))) attribute_hidden;
  34
  35 #define _MCOUNT_DECL(frompc, selfpc)                \
  36   __attribute__ ((regparm (2)))                     \
  37 void mcount_internal (u_long frompc, u_long selfpc)
  38
  39
  40 /* Define MCOUNT as empty since we have the implementation in another
  41    file.  */
  42 #define MCOUNT