sysdeps/unix/sysv/linux/profil-counter.h

   1 /* Low-level statistical profiling support function.  Linux version.
   2    Copyright (C) 2001-2021 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 License as
   7    published by the Free Software Foundation; either version 2.1 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    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 <signal.h>
  20 #include <sigcontextinfo.h>
  21
  22 /* sa_sigaction signature to use along SA_SIGINFO.  */
  23 static void
  24 __profil_counter (int signo, siginfo_t *info, void *ctx)
  25 {
  26   profil_count (sigcontext_get_pc (ctx));
  27
  28   /* This is a hack to prevent the compiler from implementing the
  29      above function call as a sibcall.  The sibcall would overwrite
  30      the signal context.  */
  31   asm volatile ("");
  32 }