298 lines
7.9 KiB
C
298 lines
7.9 KiB
C
/* $NetBSD: gmon.c,v 1.20 2003/04/06 18:05:52 dsl Exp $ */
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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 <sys/cdefs.h>
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#if !defined(lint) && defined(LIBC_SCCS)
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#if 0
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static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: gmon.c,v 1.20 2003/04/06 18:05:52 dsl Exp $");
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#endif
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#endif
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/gmon.h>
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#include <sys/sysctl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <unistd.h>
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#include <err.h>
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#include "extern.h"
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struct gmonparam _gmonparam = { GMON_PROF_OFF };
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static u_int s_scale;
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/* see profil(2) where this is describe (incorrectly) */
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#define SCALE_1_TO_1 0x10000L
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#define ERR(s) write(STDERR_FILENO, s, sizeof(s))
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void moncontrol __P((int));
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void monstartup __P((u_long, u_long));
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void _mcleanup __P((void));
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static int hertz __P((void));
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void
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monstartup(lowpc, highpc)
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u_long lowpc;
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u_long highpc;
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{
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u_long o;
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char *cp;
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struct gmonparam *p = &_gmonparam;
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/*
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* round lowpc and highpc to multiples of the density we're using
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* so the rest of the scaling (here and in gprof) stays in ints.
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*/
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p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
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p->textsize = p->highpc - p->lowpc;
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p->kcountsize = p->textsize / HISTFRACTION;
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p->hashfraction = HASHFRACTION;
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p->fromssize = p->textsize / p->hashfraction;
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p->tolimit = p->textsize * ARCDENSITY / 100;
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if (p->tolimit < MINARCS)
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p->tolimit = MINARCS;
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else if (p->tolimit > MAXARCS)
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p->tolimit = MAXARCS;
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p->tossize = p->tolimit * sizeof(struct tostruct);
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cp = sbrk((intptr_t)(p->kcountsize + p->fromssize + p->tossize));
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if (cp == (char *)-1) {
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ERR("monstartup: out of memory\n");
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return;
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}
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#ifdef notdef
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memset(cp, 0, p->kcountsize + p->fromssize + p->tossize);
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#endif
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p->tos = (struct tostruct *)(void *)cp;
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cp += (size_t)p->tossize;
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p->kcount = (u_short *)(void *)cp;
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cp += (size_t)p->kcountsize;
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p->froms = (u_short *)(void *)cp;
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__minbrk = sbrk((intptr_t)0);
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p->tos[0].link = 0;
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o = p->highpc - p->lowpc;
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if (p->kcountsize < o) {
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#ifndef notdef
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s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
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#else /* avoid floating point */
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u_long quot = o / p->kcountsize;
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if (quot >= 0x10000)
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s_scale = 1;
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else if (quot >= 0x100)
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s_scale = 0x10000 / quot;
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else if (o >= 0x800000)
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s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
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else
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s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
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#endif
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} else
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s_scale = SCALE_1_TO_1;
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moncontrol(1);
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}
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void
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_mcleanup()
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{
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int fd;
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int fromindex;
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int endfrom;
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u_long frompc;
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int toindex;
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struct rawarc rawarc;
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struct gmonparam *p = &_gmonparam;
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struct gmonhdr gmonhdr, *hdr;
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struct clockinfo clockinfo;
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int mib[2];
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size_t size;
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char *profdir;
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char *proffile;
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char buf[PATH_MAX];
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#ifdef DEBUG
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int log, len;
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char buf2[200];
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#endif
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/*
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* We disallow writing to the profiling file, if we are a
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* set{u,g}id program and our effective {u,g}id does not match
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* our real one.
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*/
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if (issetugid() && (geteuid() != getuid() || getegid() != getgid())) {
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warnx("mcount: Profiling of set{u,g}id binaries is not"
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" allowed");
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return;
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}
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if (p->state == GMON_PROF_ERROR)
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ERR("_mcleanup: tos overflow\n");
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size = sizeof(clockinfo);
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mib[0] = CTL_KERN;
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mib[1] = KERN_CLOCKRATE;
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if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
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/*
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* Best guess
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*/
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clockinfo.profhz = hertz();
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} else if (clockinfo.profhz == 0) {
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if (clockinfo.hz != 0)
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clockinfo.profhz = clockinfo.hz;
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else
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clockinfo.profhz = hertz();
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}
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moncontrol(0);
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if ((profdir = getenv("PROFDIR")) != NULL) {
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/* If PROFDIR contains a null value, no profiling
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output is produced */
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if (*profdir == '\0')
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return;
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if (snprintf(buf, sizeof buf, "%s/%d.%s",
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profdir, getpid(), getprogname()) >= sizeof buf) {
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warnx("_mcleanup: internal buffer overflow, PROFDIR too long");
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return;
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}
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proffile = buf;
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} else {
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proffile = "gmon.out";
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}
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fd = open(proffile , O_CREAT|O_TRUNC|O_WRONLY, 0666);
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if (fd < 0) {
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warn("mcount: Cannot open `%s'", proffile);
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return;
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}
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#ifdef DEBUG
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log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
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if (log < 0) {
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warn("mcount: Cannot open `gmon.log'");
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return;
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}
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len = snprintf(buf2, sizeof buf2, "[mcleanup1] kcount 0x%x ssiz %d\n",
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p->kcount, p->kcountsize);
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write(log, buf2, len);
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#endif
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hdr = (struct gmonhdr *)&gmonhdr;
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hdr->lpc = p->lowpc;
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hdr->hpc = p->highpc;
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hdr->ncnt = (int)(p->kcountsize + sizeof(gmonhdr));
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hdr->version = GMONVERSION;
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hdr->profrate = clockinfo.profhz;
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(void)write(fd, hdr, sizeof *hdr);
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(void)write(fd, p->kcount, (size_t)p->kcountsize);
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endfrom = (int)(p->fromssize / sizeof(*p->froms));
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for (fromindex = 0; fromindex < endfrom; fromindex++) {
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if (p->froms[fromindex] == 0)
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continue;
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frompc = p->lowpc;
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frompc += fromindex * p->hashfraction * sizeof(*p->froms);
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for (toindex = p->froms[fromindex]; toindex != 0;
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toindex = p->tos[toindex].link) {
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#ifdef DEBUG
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len = snprintf(buf2, sizeof buf2,
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"[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" ,
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frompc, p->tos[toindex].selfpc,
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p->tos[toindex].count);
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write(log, buf2, len);
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#endif
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rawarc.raw_frompc = frompc;
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rawarc.raw_selfpc = p->tos[toindex].selfpc;
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rawarc.raw_count = p->tos[toindex].count;
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write(fd, &rawarc, sizeof rawarc);
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}
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}
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close(fd);
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}
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/*
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* Control profiling
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* profiling is what mcount checks to see if
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* all the data structures are ready.
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*/
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void
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moncontrol(mode)
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int mode;
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{
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struct gmonparam *p = &_gmonparam;
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if (mode) {
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/* start */
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profil((char *)(void *)p->kcount, (size_t)p->kcountsize,
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p->lowpc, s_scale);
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p->state = GMON_PROF_ON;
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} else {
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/* stop */
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profil(NULL, 0, (u_long)0, 0);
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p->state = GMON_PROF_OFF;
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}
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}
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/*
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* discover the tick frequency of the machine
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* if something goes wrong, we return 0, an impossible hertz.
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*/
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static int
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hertz()
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{
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struct itimerval tim;
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tim.it_interval.tv_sec = 0;
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tim.it_interval.tv_usec = 1;
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tim.it_value.tv_sec = 0;
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tim.it_value.tv_usec = 0;
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setitimer(ITIMER_REAL, &tim, 0);
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setitimer(ITIMER_REAL, 0, &tim);
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if (tim.it_interval.tv_usec < 2)
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return(0);
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return (int)(1000000 / tim.it_interval.tv_usec);
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}
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