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

   1 /* Machine-dependent SIGPROF signal handler.  IA-64 version.
   2    Copyright (C) 1996-2014 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    <http://www.gnu.org/licenses/>.  */
  18
  19 /* In many Unix systems signal handlers are called like this
  20    and the interrupted PC is easily findable in the `struct sigcontext'.  */
  21
  22 static void
  23 profil_counter (int signr, siginfo_t *si, struct sigcontext *scp)
  24 {
  25   unsigned long ip = scp->sc_ip & ~0X3ULL, slot = scp->sc_ip & 0x3ull;
  26
  27   /* Note: Linux/ia64 encodes the slot number in bits 0 and 1.  We
  28      want to multiply the slot number by four so we can use bins of
  29      width 4 to get accurate instruction-level profiling.  */
  30   profil_count ((void *) (ip + 4*slot));
  31 }