Copied mcount.c from the library again. #include'ing it via a relative
path to a possibly-nonexistent place didn't work well enough. Sigh.
This commit is contained in:
Bruce Evans
parent
bb369b53b2
commit
1ae38af2be
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=13116
@ -1,4 +1,326 @@
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#define GPROF4 1 /* XXX can't get at kernel options */
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#define GUPROF 1 /* XXX can't get at kernel options */
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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. 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 by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#include "../lib/libc/gmon/mcount.c" /* XXX */
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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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#endif
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static const char rcsid[] =
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"$Id$";
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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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#ifdef KERNEL
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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void bintr __P((void));
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void btrap __P((void));
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void eintr __P((void));
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void user __P((void));
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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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_MCOUNT_DECL(frompc, selfpc) /* _mcount; may be static, inline, etc */
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register fptrint_t frompc, selfpc;
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{
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#ifdef GUPROF
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u_int delta;
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#endif
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register fptrdiff_t frompci;
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register u_short *frompcindex;
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register struct tostruct *top, *prevtop;
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register struct gmonparam *p;
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register long toindex;
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#ifdef KERNEL
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register int s; /* XXX */
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u_long save_eflags; /* XXX */
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#endif
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p = &_gmonparam;
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#ifndef GUPROF /* XXX */
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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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#endif
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#ifdef KERNEL
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MCOUNT_ENTER;
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#else
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p->state = GMON_PROF_BUSY;
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#endif
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frompci = frompc - p->lowpc;
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#ifdef KERNEL
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/*
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* When we are called from an exception handler, frompci may be
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* for a user address. Convert such frompci's to the index of
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* user() to merge all user counts.
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*/
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if (frompci >= p->textsize) {
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if (frompci + p->lowpc
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>= (fptrint_t)(VM_MAXUSER_ADDRESS + UPAGES * NBPG))
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goto done;
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frompci = (fptrint_t)user - p->lowpc;
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if (frompci >= p->textsize)
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goto done;
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}
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#endif /* KERNEL */
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#ifdef GUPROF
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if (p->state != GMON_PROF_HIRES)
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goto skip_guprof_stuff;
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/*
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* Look at the clock and add the count of clock cycles since the
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* clock was last looked at to a counter for frompc. This
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* solidifies the count for the function containing frompc and
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* effectively starts another clock for the current function.
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* The count for the new clock will be solidified when another
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* function call is made or the function returns.
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*
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* We use the usual sampling counters since they can be located
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* efficiently. 4-byte counters are usually necessary.
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*
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* There are many complications for subtracting the profiling
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* overheads from the counts for normal functions and adding
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* them to the counts for mcount(), mexitcount() and cputime().
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* We attempt to handle fractional cycles, but the overheads
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* are usually underestimated because they are calibrated for
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* a simpler than usual setup.
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*/
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delta = cputime() - p->mcount_overhead;
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p->cputime_overhead_resid += p->cputime_overhead_frac;
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p->mcount_overhead_resid += p->mcount_overhead_frac;
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if ((int)delta < 0)
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*p->mcount_count += delta + p->mcount_overhead
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- p->cputime_overhead;
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else if (delta != 0) {
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if (p->cputime_overhead_resid >= CALIB_SCALE) {
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p->cputime_overhead_resid -= CALIB_SCALE;
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++*p->cputime_count;
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--delta;
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}
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if (delta != 0) {
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if (p->mcount_overhead_resid >= CALIB_SCALE) {
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p->mcount_overhead_resid -= CALIB_SCALE;
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++*p->mcount_count;
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--delta;
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}
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KCOUNT(p, frompci) += delta;
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}
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*p->mcount_count += p->mcount_overhead_sub;
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}
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*p->cputime_count += p->cputime_overhead;
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skip_guprof_stuff:
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#endif /* GUPROF */
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#ifdef KERNEL
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/*
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* When we are called from an exception handler, frompc is faked
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* to be for where the exception occurred. We've just solidified
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* the count for there. Now convert frompci to the index of btrap()
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* for trap handlers and bintr() for interrupt handlers to make
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* exceptions appear in the call graph as calls from btrap() and
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* bintr() instead of calls from all over.
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*/
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if ((fptrint_t)selfpc >= (fptrint_t)btrap
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&& (fptrint_t)selfpc < (fptrint_t)eintr) {
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if ((fptrint_t)selfpc >= (fptrint_t)bintr)
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frompci = (fptrint_t)bintr - p->lowpc;
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else
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frompci = (fptrint_t)btrap - p->lowpc;
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}
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#endif /* KERNEL */
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/*
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* check that frompc 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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if (frompci >= p->textsize)
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goto done;
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frompcindex = &p->froms[frompci / (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 = toindex;
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top = &p->tos[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[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[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 = 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 = toindex;
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goto done;
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}
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}
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done:
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#ifdef KERNEL
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MCOUNT_EXIT;
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#else
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p->state = GMON_PROF_ON;
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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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/*
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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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#ifdef GUPROF
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void
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mexitcount(selfpc)
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fptrint_t selfpc;
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{
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struct gmonparam *p;
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fptrint_t selfpcdiff;
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p = &_gmonparam;
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selfpcdiff = selfpc - (fptrint_t)p->lowpc;
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if (selfpcdiff < p->textsize) {
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u_int delta;
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/*
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* Solidify the count for the current function.
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*/
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delta = cputime() - p->mexitcount_overhead;
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p->cputime_overhead_resid += p->cputime_overhead_frac;
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p->mexitcount_overhead_resid += p->mexitcount_overhead_frac;
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if ((int)delta < 0)
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*p->mexitcount_count += delta + p->mexitcount_overhead
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- p->cputime_overhead;
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else if (delta != 0) {
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if (p->cputime_overhead_resid >= CALIB_SCALE) {
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p->cputime_overhead_resid -= CALIB_SCALE;
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++*p->cputime_count;
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--delta;
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}
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if (delta != 0) {
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if (p->mexitcount_overhead_resid
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>= CALIB_SCALE) {
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p->mexitcount_overhead_resid
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-= CALIB_SCALE;
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++*p->mexitcount_count;
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--delta;
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}
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KCOUNT(p, selfpcdiff) += delta;
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}
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*p->mexitcount_count += p->mexitcount_overhead_sub;
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}
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*p->cputime_count += p->cputime_overhead;
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}
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}
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#endif /* GUPROF */
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