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2000-10-25 David Mosberger <davidm@hpl.hp.com> * sysdeps/unix/sysv/linux/ia64/profil-counter.h: Multiply slot number by four to use bins of width 4 to get accurate instruction-level profiling.
33 lines
1.4 KiB
C
33 lines
1.4 KiB
C
/* Machine-dependent SIGPROF signal handler. IA-64 version.
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Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* In many Unix systems signal handlers are called like this
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and the interrupted PC is easily findable in the `struct sigcontext'. */
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static void
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profil_counter (int signr, int code, struct sigcontext *scp)
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{
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unsigned long ip = scp->sc_ip & ~0X3ULL, slot = scp->sc_ip & 0x3ull;
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/* Note: Linux/ia64 encodes the slot number in bits 0 and 1. We
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want to multiply the slot number by four so we can use bins of
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width 4 to get accurate instruction-level profiling. */
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profil_count ((void *) (ip + 4*slot));
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}
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