1  /* i386-specific implementation of profiling support.
       2     Copyright (C) 1997-2023 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