sysdeps/i386/machine-gmon.h

   1 /* i386-specific implementation of profiling support.
   2    Copyright (C) 1997-2022 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20
  21 /* We need a special version of the `mcount' function since for ix86 it
  22    must not clobber any register.  This has several reasons:
  23      - there is a bug in gcc as of version 2.7.2.2 which prohibits the
  24        use of profiling together with nested functions
  25      - the ELF `fixup' function uses GCC's regparm feature
  26      - some (future) systems might want to pass parameters in registers.  */
  27
  28 /* We must not pollute the global namespace.  */
  29 #define mcount_internal __mcount_internal
  30
  31 extern void mcount_internal (u_long frompc, u_long selfpc)
  32   __attribute__ ((regparm (2))) attribute_hidden;
  33
  34 #define _MCOUNT_DECL(frompc, selfpc)                \
  35   __attribute__ ((regparm (2)))                     \
  36 void mcount_internal (u_long frompc, u_long selfpc)
  37
  38
  39 /* Define MCOUNT as empty since we have the implementation in another
  40    file.  */
  41 #define MCOUNT