sysdeps/unix/sysv/linux/ia64/profil-counter.h

   1 /* Machine-dependent SIGPROF signal handler.  IA-64 version.
   2    Copyright (C) 1996, 1997, 2000 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* In many Unix systems signal handlers are called like this
  21    and the interrupted PC is easily findable in the `struct sigcontext'.  */
  22
  23 static void
  24 profil_counter (int signr, siginfo_t *si, struct sigcontext *scp)
  25 {
  26   unsigned long ip = scp->sc_ip & ~0X3ULL, slot = scp->sc_ip & 0x3ull;
  27
  28   /* Note: Linux/ia64 encodes the slot number in bits 0 and 1.  We
  29      want to multiply the slot number by four so we can use bins of
  30      width 4 to get accurate instruction-level profiling.  */
  31   profil_count ((void *) (ip + 4*slot));
  32 }