* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
274 lines
8.1 KiB
C
274 lines
8.1 KiB
C
/* $NetBSD: mcount.c,v 1.10 2012/03/20 16:21:41 matt Exp $ */
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/*
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* Copyright (c) 2003, 2004 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Nathan J. Williams for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1983, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* If building a standalone libkern, don't include mcount. */
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#if (!defined(_KERNEL) || defined(GPROF)) && !defined(_STANDALONE)
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#ifdef _KERNEL_OPT
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#include "opt_multiprocessor.h"
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#endif
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#include <sys/cdefs.h>
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#if !defined(lint) && !defined(_KERNEL) && defined(LIBC_SCCS)
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#if 0
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static char sccsid[] = "@(#)mcount.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: mcount.c,v 1.10 2012/03/20 16:21:41 matt Exp $");
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#endif
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#endif
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#include <sys/param.h>
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#include <sys/gmon.h>
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#ifndef _KERNEL
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#include "reentrant.h"
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#endif
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#ifdef _REENTRANT
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extern thread_key_t _gmonkey;
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extern struct gmonparam _gmondummy;
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struct gmonparam *_m_gmon_alloc(void);
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#endif
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#ifndef __LINT__
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_MCOUNT_DECL(u_long, u_long)
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#ifdef _KERNEL
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__attribute__((__no_instrument_function__))
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#endif
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__used;
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#endif
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/* XXX: make these interfaces */
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#ifdef _RUMPKERNEL
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#undef MCOUNT_ENTER
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#define MCOUNT_ENTER
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#undef MCOUNT_EXIT
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#define MCOUNT_EXIT
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#undef MCOUNT
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#define MCOUNT
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#endif
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/*
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* mcount is called on entry to each function compiled with the profiling
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* switch set. _mcount(), which is declared in a machine-dependent way
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* with _MCOUNT_DECL, does the actual work and is either inlined into a
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* C routine or called by an assembly stub. In any case, this magic is
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* taken care of by the MCOUNT definition in <machine/profile.h>.
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*
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* _mcount updates data structures that represent traversals of the
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* program's call graph edges. frompc and selfpc are the return
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* address and function address that represents the given call graph edge.
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*
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* Note: the original BSD code used the same variable (frompcindex) for
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* both frompcindex and frompc. Any reasonable, modern compiler will
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* perform this optimization.
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*/
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#ifndef __LINT__
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/* _mcount; may be static, inline, etc */
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_MCOUNT_DECL(u_long frompc, u_long selfpc)
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{
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u_short *frompcindex;
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struct tostruct *top, *prevtop;
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struct gmonparam *p;
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long toindex;
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#if defined(_KERNEL) && !defined(_RUMPKERNEL)
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int s;
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#endif
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#if defined(_REENTRANT) && !defined(_KERNEL)
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if (__isthreaded) {
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p = thr_getspecific(_gmonkey);
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if (p == NULL) {
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/* Prevent recursive calls while allocating */
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thr_setspecific(_gmonkey, &_gmondummy);
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p = _m_gmon_alloc();
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}
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} else
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#endif
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p = &_gmonparam;
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/*
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* check that we are profiling
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* and that we aren't recursively invoked.
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*/
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if (p->state != GMON_PROF_ON)
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return;
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#ifdef _KERNEL
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MCOUNT_ENTER;
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#endif
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p->state = GMON_PROF_BUSY;
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/*
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* check that frompcindex is a reasonable pc value.
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* for example: signal catchers get called from the stack,
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* not from text space. too bad.
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*/
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frompc -= p->lowpc;
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if (frompc > p->textsize)
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goto done;
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#if (HASHFRACTION & (HASHFRACTION - 1)) == 0
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if (p->hashfraction == HASHFRACTION)
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frompcindex =
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&p->froms[
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(size_t)(frompc / (HASHFRACTION * sizeof(*p->froms)))];
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else
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#endif
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frompcindex =
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&p->froms[
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(size_t)(frompc / (p->hashfraction * sizeof(*p->froms)))];
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toindex = *frompcindex;
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if (toindex == 0) {
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/*
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* first time traversing this arc
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*/
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toindex = ++p->tos[0].link;
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if (toindex >= p->tolimit)
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/* halt further profiling */
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goto overflow;
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*frompcindex = (u_short)toindex;
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top = &p->tos[(size_t)toindex];
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top->selfpc = selfpc;
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top->count = 1;
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top->link = 0;
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goto done;
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}
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top = &p->tos[(size_t)toindex];
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if (top->selfpc == selfpc) {
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/*
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* arc at front of chain; usual case.
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*/
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top->count++;
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goto done;
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}
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/*
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* have to go looking down chain for it.
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* top points to what we are looking at,
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* prevtop points to previous top.
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* we know it is not at the head of the chain.
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*/
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for (; /* goto done */; ) {
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if (top->link == 0) {
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/*
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* top is end of the chain and none of the chain
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* had top->selfpc == selfpc.
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* so we allocate a new tostruct
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* and link it to the head of the chain.
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*/
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toindex = ++p->tos[0].link;
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if (toindex >= p->tolimit)
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goto overflow;
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top = &p->tos[(size_t)toindex];
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top->selfpc = selfpc;
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top->count = 1;
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top->link = *frompcindex;
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*frompcindex = (u_short)toindex;
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goto done;
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}
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/*
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* otherwise, check the next arc on the chain.
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*/
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prevtop = top;
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top = &p->tos[top->link];
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if (top->selfpc == selfpc) {
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/*
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* there it is.
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* increment its count
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* move it to the head of the chain.
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*/
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top->count++;
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toindex = prevtop->link;
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prevtop->link = top->link;
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top->link = *frompcindex;
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*frompcindex = (u_short)toindex;
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goto done;
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}
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}
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done:
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p->state = GMON_PROF_ON;
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#ifdef _KERNEL
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MCOUNT_EXIT;
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#endif
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return;
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overflow:
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p->state = GMON_PROF_ERROR;
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#ifdef _KERNEL
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MCOUNT_EXIT;
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#endif
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return;
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}
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#endif
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#ifdef MCOUNT
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/*
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* Actual definition of mcount function. Defined in <machine/profile.h>,
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* which is included by <sys/gmon.h>.
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*/
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MCOUNT
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#endif
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#endif /* (!_KERNEL || GPROF) && !_STANDALONE */
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